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M10: apply soft-mask Decode intervals to image exports
This commit is contained in:
Kyle Kassen
+6
-1
@@ -2,7 +2,7 @@
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**Stage: alpha** · next: beta, ~25% (ready for real work 50% → 75%) and ~400–700 h away
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> **Last reviewed:** 2026-10-22 · **Last updated:** 2026-10-22 · **Change:** minor (M14, #3558: rebase guarded macOS per-file association recovery onto current main; estimates unchanged)
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> **Last reviewed:** 2026-10-23 · **Last updated:** 2026-10-23 · **Change:** minor (M10: image export preserves soft-mask Decode opacity ranges; estimates unchanged)
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> **Last reviewed:** 2026-10-21 · **Last updated:** 2026-10-21 · **Change:** minor (M3, #3808: the Pages inspector has an independent 50–150% thumbnail size slider and buttons; selection and current-page following are retained, with headless ui.set coverage. Estimates unchanged.)
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> **Last reviewed:** 2026-10-20 | **Last updated:** 2026-10-20 | **Change:** minor (M11 #3507: image merging preserves content stream boundaries; estimates unchanged)
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> **Last reviewed:** 2026-10-20 | **Last updated:** 2026-10-20 | **Change:** minor (M10, #3532 partial: vector printing retains existing appearances with absent Subtype; estimates unchanged)
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@@ -191,6 +191,10 @@ Ranked; detail and the full milestone table in [docs/roadmap.md](docs/roadmap.md
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## Progress log
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- **2026-10-23 (M10, image export):** Soft-mask Decode intervals preserve partial opacity in Export all images and Save Image As.
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Synthetic regressions cover direct and indirect ranges, inverted/subrange alpha, packed masks, JPEG masks and unchanged image component Decode.
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Estimates unchanged.
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- **2026-10-22 (M4, #3916 partial):** Document edits and Undo/Redo cancel an Organize page drag. Pointer-release regressions check exact page order and save/reopen.
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- **2026-10-22 (M14, macOS association recovery candidate):** Successful desktop open/save/sign can queue recovery of an existing per-file binding to the running PDFCraft bundle through NSWorkspace. Metadata-only watcher changes retain undo and avoid false overwrite prompts; real same-length/same-mtime edits remain protected. Rebased on 0.12.0 and reuses #3042's shared atomic metadata preservation; the bounded recovery parser does not narrow save limits. Prior native Preview TEST-signature and Finder workflows passed on macOS 27.0.1; other versions remain unqualified. Estimates unchanged.
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- **2026-10-13 (M7, free image rotation):** A selected page image has a rotate knob (Shift: 15 degree steps) and `image_edit` a `rotate_by` action; the angle is written as one undoable `cm`. Snapping to page edges while moving is in #1740; resize snapping is not done. Estimates unchanged.
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@@ -640,6 +644,7 @@ Newest first: the date, what moved, and the new overall estimate.
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| Date | Change | Summary |
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|---|---|---|
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| 2026-10-23 | minor | M10: Export all images and Save Image As apply soft-mask Decode intervals to PNG alpha before resizing, including inverted/subrange, indirect, packed and JPEG masks. Estimates unchanged. |
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| 2026-10-22 | minor | M4, #3916 partial: document edits and Undo/Redo cancel Organize drags. Pointer-release and save/reopen regressions check page order. Estimates unchanged. |
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| 2026-10-20 | minor | M4: initial-view window and interface options resolve indirect boolean ViewerPreferences values; synthetic true/false and save/reopen regressions retain defaults for malformed entries. Estimates unchanged. |
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| 2026-10-20 | minor | M6, #3502: form detection preserves comments across content streams; estimates unchanged. |
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@@ -27,5 +27,7 @@ Every function returns a `pdfcraft_cos::Document`; the caller writes it.
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Image export and Save Image As apply each lossless image's Decode pair before converting its color components.
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Indexed Decode values select palette entries after rounding and clipping. Color-key masks compare the original samples.
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Missing, null or malformed Decode arrays keep the default mapping.
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The existing 16-bit path still uses each sample's high byte. JPEG and mask Decode handling remain limited.
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Soft-mask Decode intervals map samples to opacity before the mask is resized, including reversed ranges and indirect entries.
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The existing 16-bit path still uses each sample's high byte.
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JPEG image Decode handling remains limited.
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ICC transforms and calibrated color conversion remain outside this export path.
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@@ -465,7 +465,7 @@ fn stencil_mask(doc: &Document, s: &Stream, w: usize, h: usize) -> Option<Vec<u8
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Some(gray_plane(doc, m, w, h)?.into_iter().map(|v| 255 - v).collect())
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}
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/// A one-component mask image as 8-bit values (its `/Decode` inversion applied), scaled to
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/// A one-component mask image as 8-bit values (its `/Decode` interval applied), scaled to
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/// `w` × `h`. `None` when it can't be decoded (JPEG 2000, JBIG2 and CCITT masks).
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fn gray_plane(doc: &Document, m: &Stream, w: usize, h: usize) -> Option<Vec<u8>> {
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let (mw, mh) = size(m.dict.int(b"Width")?, m.dict.int(b"Height")?)?;
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@@ -491,14 +491,11 @@ fn gray_plane(doc: &Document, m: &Stream, w: usize, h: usize) -> Option<Vec<u8>>
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unpack(&m.decoded().ok()?, mw, mh, 1, bpc)?.into_iter().map(|v| (v as u32 * 255 / max) as u8).collect()
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}
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};
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let invert = m
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.dict
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.get(b"Decode")
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.map(|d| doc.resolve(d))
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.and_then(|d| d.as_array().map(|a| a.first().and_then(Object::as_f64) > a.get(1).and_then(Object::as_f64)))
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.unwrap_or(false);
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if invert {
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px.iter_mut().for_each(|v| *v = 255 - *v);
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if let Some([lo, hi]) = decode(doc, m, 1).and_then(|pairs| pairs.first().copied()) {
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for value in &mut px {
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let t = f64::from(*value) / 255.0;
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*value = (((1.0 - t) * lo + t * hi).clamp(0.0, 1.0) * 255.0).round() as u8;
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}
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}
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if (mw, mh) == (w, h) {
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return Some(px);
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@@ -682,6 +682,74 @@ fn jpeg_images_with_a_soft_mask_export_as_png_with_alpha() {
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assert_eq!((out.images[0].extension, &out.images[0].data), ("jpg", &real_jpeg()));
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}
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#[test]
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/// Both image export paths apply mask intervals independently of the image's component Decode.
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fn soft_mask_decode_ranges_become_exported_alpha() {
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for indirect in [false, true] {
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for (range, expected) in [
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([0.25, 0.75], [64, 128, 191]),
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([0.75, 0.25], [191, 127, 64]),
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([1.0, 0.0], [255, 127, 0]),
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([-1.0, 2.0], [0, 129, 255]),
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([0.5, 0.5], [128, 128, 128]),
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] {
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let mut doc = from_images(&[("flat.png".into(), png_bytes(false))]).unwrap();
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with_image(&mut doc, |doc| {
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let endpoints = range.into_iter().map(|v| {
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let value = Object::Real(v);
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if indirect { Object::Ref(doc.add(value)) } else { value }
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});
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let decode = Object::Array(endpoints.collect());
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let decode = if indirect { Object::Ref(doc.add(decode)) } else { decode };
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let mut mask = image_dict(3, 1, "DeviceGray", 8);
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mask.set(b"Decode".to_vec(), decode);
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let mask = doc.add(Object::Stream(Stream::from_raw(mask, vec![0, 128, 255])));
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let mut image = image_dict(3, 1, "DeviceRGB", 8);
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image.set(b"SMask".to_vec(), Object::Ref(mask));
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image.set(b"Decode".to_vec(), decode_array(&[1.0, 0.0, 0.0, 1.0, 0.0, 1.0]));
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Stream::from_raw(image, [0, 64, 255].repeat(3))
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});
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let doc = reopen(&doc);
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let out = extract_images(&doc, &[0], 0);
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assert!(out.skipped.is_empty(), "{:?}", out.skipped);
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assert_eq!(out.images.len(), 1);
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let pixels = exported_png_pixels(&out.images[0].data);
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assert_eq!(alphas(&pixels), expected, "Decode {range:?}, indirect={indirect}");
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assert!(pixels.as_chunks::<4>().0.iter().all(|p| p[..3] == [255, 64, 255]), "image component Decode stays independent");
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let (ext, bytes) = image_file(&doc, out.images[0].object).unwrap();
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assert_eq!(ext, "png");
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assert_eq!(exported_png_pixels(&bytes), pixels, "Save Image As and Export all images agree");
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}
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}
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}
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#[test]
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/// Packed and JPEG samples map to opacity before resizing to their image's dimensions.
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fn soft_mask_decode_maps_packed_and_jpeg_masks_before_resizing() {
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for jpeg in [false, true] {
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let mut doc = from_images(&[("flat.png".into(), png_bytes(false))]).unwrap();
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with_image(&mut doc, |doc| {
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let mask = if jpeg {
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let mut mask = image_dict(4, 2, "DeviceGray", 8);
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mask.set(b"Filter".to_vec(), Object::name("DCTDecode"));
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mask.set(b"Decode".to_vec(), decode_array(&[0.25, 0.25]));
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Stream::from_raw(mask, real_jpeg())
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} else {
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let mut mask = image_dict(2, 1, "DeviceGray", 1);
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mask.set(b"Decode".to_vec(), decode_array(&[-1.0, 2.0]));
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Stream::from_raw(mask, vec![0b0100_0000])
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};
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let mask = doc.add(Object::Stream(mask));
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let mut image = image_dict(4, 2, "DeviceRGB", 8);
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image.set(b"SMask".to_vec(), Object::Ref(mask));
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Stream::from_raw(image, vec![10; 24])
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});
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// Clipping before resizing differs from resizing first, then clipping to [0, 255].
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let expected = if jpeg { vec![64; 8] } else { vec![0, 64, 191, 255, 0, 64, 191, 255] };
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assert_eq!(alphas(&exported_rgba(&reopen(&doc)).1), expected, "jpeg={jpeg}");
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}
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}
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#[test]
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fn soft_masks_of_another_size_and_stencil_and_colour_key_masks_become_alpha() {
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// A 2×1 soft mask on a 4×2 image is scaled to the image's size.
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+3
-2
@@ -1,6 +1,6 @@
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# PdfCraft roadmap: milestones and what's next
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> **Last reviewed:** 2026-10-22 · **Last updated:** 2026-10-22 · **Change:** minor (M14, #3558: rebase guarded macOS per-file association recovery onto current main; estimates unchanged)
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> **Last reviewed:** 2026-10-23 · **Last updated:** 2026-10-23 · **Change:** minor (M10: image export preserves soft-mask Decode opacity ranges; estimates unchanged)
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> **Last reviewed:** 2026-10-20 · **Last updated:** 2026-10-20 · **Change:** minor (M12 #3673: Character encoding accepts Identity-H/V with Adobe CJK collections; estimates unchanged)
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> **Last reviewed:** 2026-10-20 | **Last updated:** 2026-10-20 | **Change:** minor (M10, #3532 partial: vector printing retains existing appearances with absent Subtype; estimates unchanged)
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@@ -184,7 +184,7 @@ total matches the parity estimate.
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| M7 | Content editing (text, images, header/footer, watermark) | 250–500 | 20% | 100–180 | Done: header & footer, watermarks, backgrounds, Bates; added text and images that stay editable (move, resize, format, rotate, flip, crop, replace); links (Link tool, Link Properties, create from URLs, remove all). Missing: editing existing text and images in place (the longest pole), image/PDF watermarks |
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| M8 | Security + redaction | 100–180 | 68% | 15–30 | Done: opening protected documents, permissions, Protect Using Password, Remove security; redaction (mark text/areas/pages, Search & Redact with patterns, apply removing glyphs, image pixels, vectors, XObject content, annotations and fields, verification, full rewrite on save); Remove hidden information and Sanitize.<br>Done since: redaction codes (U.S. FOIA and Privacy Act sets as overlay text, in Redaction properties and `redact_mark`). Redaction cleans indirect and form structure references, preserving surviving form tags. Redaction retires inherited resource dictionaries, so a parent `/Pages` can't keep a removed XObject reachable; unredacted pages are left untouched. Image redaction removes alternate images and unsupported masks only on affected images. Changed marked-content spans lose replacement descriptions; untouched spans keep theirs. Hidden-text cleanup retires unused named descriptions across inherited/shared page and form resources (64 focused tests and scoped Rust 1.96 Clippy/wasm checks pass; publication CI pending). The redaction audit counts a filled cover that hides half of any one word of a long line (#2662), applied or not. Missing: certificate security, custom redaction code sets and pattern locales, DCT re-encoding |
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| M9 | Signatures (PAdES, validation) | 160–280 | 60% | 40–70 | Done: new `sign` crate (DER, X.509, CMS, PKCS #12 on RustCrypto; aws-lc-rs for RSA private keys); PAdES B-B signing (visible, invisible, existing fields, certification with DocMDP); validation with trust store and changes-after-signing classification; self-signed digital IDs; Signatures panel, message bar, sign dialogs; agent tools. Checked with pdfsig and OpenSSL.<br>Done since: macOS Keychain and Windows Current User Personal store signing (software-backed CNG keys), certificate viewer, signed documents protected from rewrites, page validation overlays separate from original signature artwork (baked Not Verified captions remain; #79 open), snapshot tabs that reuse instead of multiplying. Missing: timestamps (B-T), LTV (DSS, OCSP, CRL), FieldMDP, smart cards, PKCS #11 |
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| M10 | OCR, create, export, print | 200–350 | 33% | 120–215 | Done: create from blank/text/PNG/JPEG/TIFF (multi-page)/GIF/BMP; export PNG/JPEG/TIFF and text; Print (Acrobat's sizing, n-up, booklet, poster, comments & forms, preview, the CUPS and Windows spoolers, print-ready PDF).<br>Done since: embedded/72/custom DPI choices for image imports; export all images; OCR (searchable image for pages, ranges and multiple files); single-sided cut-and-stack imposition with cut marks, through Print and doc_print; architectural/ANSI/large ISO sheet presets, Match page at 100% and PDF-scale preview (#599 follow-up); Create PDF from multiple files (PDFs, images and text, edited as pages in the grid); OCR can also read pictures on pages that have text, without adding that text twice (#1028). Done since: Word invoice export uses borderless inferred tables, floating positioned text/artwork only where text overlaps an image or is rotated, and per-page sizes, covered by synthetic invoice automation regressions (#773); printing on the web through the browser's print dialog, sheets drawn by PdfCraft (gap 4). Lossless image export applies per-component Decode, including Indexed mapping (#1201 partial). Existing 16-bit precision and color-management limits remain. #3532 partial: vector printing retains existing appearances with absent Subtype through a print-owned Form copy; source artwork stays unchanged. #3120: Office export reads form XObjects 50 levels deep, as the renderer does, and up to 50 000 a page; pages past that are listed in `truncated_pages`. Missing: OCR languages beyond Latin, editable-text OCR output, full Office layout fidelity/import. Done since: dotted-leader contents entries stay in separate complete paragraphs (#1757) #2156 candidate: last selected print paper persists across sessions; other print preferences unchanged. |
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| M10 | OCR, create, export, print | 200–350 | 33% | 120–215 | Done: create from blank/text/PNG/JPEG/TIFF (multi-page)/GIF/BMP; export PNG/JPEG/TIFF and text; Print (Acrobat's sizing, n-up, booklet, poster, comments & forms, preview, the CUPS and Windows spoolers, print-ready PDF).<br>Done since: embedded/72/custom DPI choices for image imports; export all images; OCR (searchable image for pages, ranges and multiple files); single-sided cut-and-stack imposition with cut marks, through Print and doc_print; architectural/ANSI/large ISO sheet presets, Match page at 100% and PDF-scale preview (#599 follow-up); Create PDF from multiple files (PDFs, images and text, edited as pages in the grid); OCR can also read pictures on pages that have text, without adding that text twice (#1028). Done since: Word invoice export uses borderless inferred tables, floating positioned text/artwork only where text overlaps an image or is rotated, and per-page sizes, covered by synthetic invoice automation regressions (#773); printing on the web through the browser's print dialog, sheets drawn by PdfCraft (gap 4). Lossless image export applies per-component Decode, including Indexed mapping (#1201 partial). Existing 16-bit precision and color-management limits remain. #3532 partial: vector printing retains existing appearances with absent Subtype through a print-owned Form copy; source artwork stays unchanged. #3120: Office export reads form XObjects 50 levels deep, as the renderer does, and up to 50 000 a page; pages past that are listed in `truncated_pages`. Missing: OCR languages beyond Latin, editable-text OCR output, full Office layout fidelity/import. Done since: dotted-leader contents entries stay in separate complete paragraphs (#1757) #2156 candidate: last selected print paper persists across sessions; other print preferences unchanged. Image export applies soft-mask Decode opacity intervals before resizing, including indirect entries and inverted ranges. |
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| M11 | Optimize, preflight, PDF/A/X/UA, print production | 200–350 | 18% | 80–140 | Done: new `optimize` crate: Reduce File Size and the PDF Optimizer (images measured where drawn, bicubic downsampling, JPEG/ZIP recompression only when smaller, discard objects and user data, Flate clean-up, resource merging, object streams). Content stream boundaries preserve comments, split operands and graphics state when image fragments merge. Done since: reject invalid image and soft-mask dimensions with checked sizing (#2178). Missing: fonts and transparency panels, space audit, preflight, PDF/A/X/UA |
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| M12 | Accessibility, compare, measure, search, XFA | 200–380 | 30% | 90–160 | Done: new `a11y` crate with the Accessibility Checker (all 32 rules, report, Fix/Skip/Explain, options dialog and results panel, agent tools). Locatable figure, annotation and form findings highlight their page bounds. Character encoding accepts Identity-H/V with Adobe CJK collections and predefined CJK CMaps independently (#3673); per-glyph validation and embedded-font extraction remain separate.<br>Done since: 2D distance, perimeter and area measurements with persistent viewport calibration, snapping, live information and CSV export; a bounded, text-only auto-tag proposal tool for one page. Marking a figure decorative rewrites only that stream (#1324). An XFA radio item whose value contains a space is written back unchanged (#1319). Done since: #2569: Growable multiline XFA text reflows after edits, with undo/redo, save/reopen and print coverage; oversized fields still become read-only page text. Structured-data synchronization warnings retain accepted whitespace without relayout from stale data. Done since: #2572: Every repeated page-master button resolves its own field to the shared XFA click script, including print buttons. Done since: #2570: Dynamic XFA rich-text fields carry exData/maxLength into AcroForm MaxLen for reported and enforced Unicode character limits, retained after save/reopen. Missing: writing proposed tags and parent tree, field autotag, visual Tags/Order/Content panels, Reading Order tool, compare, geospatial/3D measurement, search index, XFA<br>Reading colours: pending page backgrounds follow the configured colour (#2059). |
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| M13 | Automation (MCP, Action Wizard, CLI) + AI providers | 60–120 | 45% | 25–45 | Done: MCP resources (document info, text, page images); headless tool table (123 tools incl. signing, optimizing, initial view, links, stamps, data exchange, comment review, forms authoring and scripts, redaction, sanitize, print, add content), opt-in MCP server over stdio, CLI `run`/`tools` (closed stdout pipes exit cleanly), UI control channel with drag. Missing: Action Wizard, AI providers<br>Done since: CLI run and MCP reject missing, empty, repeated and option-valued --root arguments before any tool/script execution or MCP initialization. A single-hyphen directory name remains valid; synthetic CLI regressions preserve a would-be overwritten file. `text_find` also caps the per-page match ranges it materializes at the remaining result limit plus one continuation match. CLI robustness scans visit each directory once through overlapping roots and symlink aliases. |
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@@ -239,6 +239,7 @@ M2 (renderer), M7 (content editing), M10 (OCR and Office), M11 (Preflight and st
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| Date | Change | Summary |
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|---|---|---|
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| 2026-10-23 | minor | M10: Export all images and Save Image As apply soft-mask Decode intervals to PNG alpha before resizing, including inverted/subrange, indirect, packed and JPEG masks. Estimates unchanged. |
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| 2026-10-22 | minor | M4, #3916 partial: edits and Undo/Redo cancel Organize page drags. Pointer-release and save/reopen regressions check page order. Estimates unchanged. |
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| 2026-10-22 | minor | M14 #3558: rebased macOS association recovery; reuse #3042 shared metadata preservation instead of a duplicate save wrapper. Estimates unchanged. |
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| 2026-10-20 | minor | M4: initial-view window and interface options resolve indirect boolean ViewerPreferences values; synthetic true/false and save/reopen regressions retain defaults for malformed entries. Estimates unchanged. |
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@@ -2142,8 +2142,8 @@ milestone = "M7"
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status = "shipped"
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commands = ["edit.edit_text"]
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tools = ["image_save"]
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evidence = ["crates/edit/src/tests.rs::page_images_move_turn_replace_and_delete", "crates/ui-egui/tests/it/editing.rs::editing_existing_images_on_the_page", "crates/automation/tests/it/automation.rs::editing_page_images_through_tools", "crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::lossless_decode_maps_each_component_before_colour_conversion", "crates/create/src/tests.rs::lossless_indexed_decode_rounds_in_index_units_then_clamps"]
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notes = "right-click an image ▸ Save Image As: JPEG unchanged, others PNG. Lossless images apply per-component Decode; Indexed values round and clip before palette lookup. Missing, null or malformed Decode arrays keep the default mapping. Still limited: 16-bit samples use high bytes; general JPEG and mask Decode, ICC transforms, and calibrated colors remain unsupported."
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evidence = ["crates/edit/src/tests.rs::page_images_move_turn_replace_and_delete", "crates/ui-egui/tests/it/editing.rs::editing_existing_images_on_the_page", "crates/automation/tests/it/automation.rs::editing_page_images_through_tools", "crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::lossless_decode_maps_each_component_before_colour_conversion", "crates/create/src/tests.rs::lossless_indexed_decode_rounds_in_index_units_then_clamps", "crates/create/src/tests.rs::soft_mask_decode_ranges_become_exported_alpha"]
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notes = "right-click an image ▸ Save Image As: JPEG unchanged, others PNG. Lossless images apply per-component Decode; Indexed values round and clip before palette lookup. Missing, null or malformed Decode arrays keep the default mapping. Soft-mask Decode intervals preserve opacity before resizing, including indirect arrays and endpoints. Still limited: 16-bit samples use high bytes; general JPEG image Decode, ICC transforms, and calibrated colors remain unsupported."
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[[feature]]
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id = "edit.image-external-editor"
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@@ -7105,8 +7105,8 @@ milestone = "M10"
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status = "shipped"
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commands = ["export.all_images"]
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tools = ["doc_export_all_images"]
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evidence = ["crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::indexed_and_one_bit_images_decode", "crates/create/src/tests.rs::jpeg_images_with_a_soft_mask_export_as_png_with_alpha", "crates/create/src/tests.rs::soft_masks_of_another_size_and_stencil_and_colour_key_masks_become_alpha", "crates/automation/tests/it/automation.rs::exporting_all_images_through_tools", "crates/ui-egui/tests/it/export.rs::export_dialogs_write_images_and_text", "crates/create/src/tests.rs::lossless_decode_maps_each_component_before_colour_conversion", "crates/create/src/tests.rs::lossless_indexed_decode_rounds_in_index_units_then_clamps"]
|
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notes = "each image once (page resources and nested forms); JPEG unchanged unless it has transparency, others PNG (gray/RGB/CMYK/ICC/Indexed, 1–16 bpc, stencil masks); transparency as PNG alpha: /SMask (scaled to the image size, /Matte un-blended), stencil /Mask and colour-key /Mask, JPEG images included (#645); JPX/JBIG2/CCITT masks are left out (image exported opaque); JPX/JBIG2/CCITT/separations reported as skipped; minimum size filter. Lossless images apply per-component Decode; Indexed values round and clip before palette lookup. Missing, null or malformed Decode arrays keep the default mapping. Still limited: 16-bit samples use high bytes; general JPEG and mask Decode, ICC transforms, and calibrated colors remain unsupported."
|
||||
evidence = ["crates/create/src/tests.rs::images_export_as_jpeg_unchanged_and_others_as_png", "crates/create/src/tests.rs::indexed_and_one_bit_images_decode", "crates/create/src/tests.rs::jpeg_images_with_a_soft_mask_export_as_png_with_alpha", "crates/create/src/tests.rs::soft_masks_of_another_size_and_stencil_and_colour_key_masks_become_alpha", "crates/create/src/tests.rs::soft_mask_decode_ranges_become_exported_alpha", "crates/create/src/tests.rs::soft_mask_decode_maps_packed_and_jpeg_masks_before_resizing", "crates/automation/tests/it/automation.rs::exporting_all_images_through_tools", "crates/ui-egui/tests/it/export.rs::export_dialogs_write_images_and_text", "crates/create/src/tests.rs::lossless_decode_maps_each_component_before_colour_conversion", "crates/create/src/tests.rs::lossless_indexed_decode_rounds_in_index_units_then_clamps"]
|
||||
notes = "each image once (page resources and nested forms); JPEG unchanged unless it has transparency, others PNG (gray/RGB/CMYK/ICC/Indexed, 1–16 bpc, stencil masks); transparency as PNG alpha: /SMask (scaled to the image size, /Matte un-blended), stencil /Mask and colour-key /Mask, JPEG images included (#645); JPX/JBIG2/CCITT masks are left out (image exported opaque); JPX/JBIG2/CCITT/separations reported as skipped; minimum size filter. Lossless images apply per-component Decode; Indexed values round and clip before palette lookup. Missing, null or malformed Decode arrays keep the default mapping. Soft-mask Decode intervals preserve opacity before resizing, including indirect arrays and endpoints. Still limited: 16-bit samples use high bytes; general JPEG image Decode, ICC transforms, and calibrated colors remain unsupported."
|
||||
|
||||
[[feature]]
|
||||
id = "create.export-html"
|
||||
|
||||
Reference in New Issue
Block a user