aleleba/vectorcraft
1
0
Fork 0
mirror of https://github.com/storytold/vectorcraft.git synced 2026-10-28 11:47:21 -06:00
Code Issues Packages Projects Releases Wiki Activity

M4.83: overprinting fills and strokes overprint in PDF

Browse Source 
Advanced > Overprint: Preserve (the default; document.exportPdf
advanced.overprint) writes each overprinting fill and stroke (an object's
own, a character's, a type object's) with a graphics state of /OP true
/op true /OPM 1 (/OPM 0 in PDF/A); Discard writes none. White ones knock out
when Document Setup's Discard White Overprint is on, as in print. Mask art
never overprints. File > Print's composite PDF honours Print > Advanced >
Overprints: Preserve the same way (separations keep multiplying plates).

Each overprinting fill or stroke is drawn as a form marked to overprint
(crates/pdf/src/forms.rs); after writing, its content starts by setting the
overprinting graphics state, and the PDF/X self-check runs on the result.
The engine's "overprint is not written to PDF yet" warning and print's
"overprints print as knockouts in composite output" warning are gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-05 17:39:28 +07:00
co-authored by Claude Opus 5.5
parent 0e4d3f6871
commit a09cbe58c8
12 changed files with 224 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/mcp.md
+6 -2
View File
@@ -451,6 +451,9 @@ of knocking them out. `object.setOverprint {fill?, stroke?, item?, ids?}` sets i
characters too; `item` aims at one appearance item) and `attributes.info {ids?}` reads it back (`null` where the
objects differ). Overprint Preview (`view.overprintPreview`) and Separations Preview show it; rendering approximates
it by multiplying. Older files that listed Overprint Black objects in the document get the flags on load.
PDF export writes them with `advanced.overprint: "preserve"` (the default): each overprinting fill and stroke sets a
graphics state with `/OP true /op true /OPM 1` (`/OPM 0` in PDF/A). With `discardWhiteOverprint` (`document.setup`, on by
default) white ones knock out instead; `"discard"` writes none.
```json
{"name":"run_command","arguments":{"command":"object.setOverprint","params":{"ids":[12],"stroke":true}}}
@@ -1303,7 +1306,7 @@ documents every field:
with; without preserveNumbers CMYK colours are separated again).
Halftone screens and a fixed flatness are not written to the PDF (the output device's apply): the warnings say so,
as they do for art larger than the imageable area and for overprints in composite output.
as they do for art larger than the imageable area.
```json
{"name":"run_command","arguments":{"command":"print.setup","params":{"settings":{"media":"a4","scaling":"fit","marks":{"trim":true}}}}}
@@ -1614,7 +1617,8 @@ the placement then shows as placed by the tool, with a Reset button; dragging th
The Print dialog's Advanced section and the printer profile are print settings too (`print.setup`, `print.preview`,
`file.print`): `advanced: {printAsBitmap, overprints: preserve|discard|simulate, flattenerPreset}` and `color:
{profile}`. In composite output, `discard` makes overprinting fills and strokes knock out and `simulate` prints them
{profile}`. In composite output, `preserve` writes overprinting fills and strokes with an overprinting graphics state
(`/OP`, as PDF export does), `discard` makes overprinting fills and strokes knock out and `simulate` prints them
as Overprint Preview shows them (multiplied); either way the file has no overprint left. Separations always keep
overprints. `flattenerPreset` (High Resolution, Medium Resolution, Low Resolution or a saved preset,
`flattener.presets.list`) flattens transparency before printing, as Object → Flatten Transparency does; empty, a