Codecs: open Cineon (.cin) film frames read-only (#4691)

* Raw: measure the Nikon D90 image area (4288x2848 at (10, 10))

Aligning the decoded D90 sensor plane with the camera's own JPEG puts the
image at (10, 10) in the 4352x2868 sensor plane, giving the camera's
4288x2848 frame (10-pixel margins; the right border reads the camera's flat
255 from column 4310). Add the measured ImageArea so a D90 NEF opens on the
camera's frame instead of the uncropped plane, and make a measured profile
leave a file that carries its own colour calibration (a DNG) untouched.

* Codecs: open Cineon (.cin) film frames read-only

Cineon is the 10-bit logarithmic film-scan format DPX grew from. Read it from
the same Kodak header family: the generic header (big-endian, orientation at
192, channel count at 193, the channel-1 bits/dimensions), one or three
channels, three 10-bit samples packed into each 32-bit word on a word
boundary. The 10-bit code values open as U16 (round(c x 65535 / 1023)); the
file's log black/white points are a display choice and are not applied. A
depth other than 10 bits or a channel count other than 1/3 is Unsupported;
truncation errors rather than panicking. Read-only (no Cineon writer), so
.cin joins the open filters and Cineon read closes part of #1049's G10 gap.

* cargo fmt the extension lists

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/codecs/README.md

@@ -47,6 +47,7 @@ let out = encode(&img, Format::Tiff, &EncodeOptions::default())?;
 | Radiance HDR | yes | yes | F32 | RGB | no | no | no | no | no | no | yes (RGBE) | `image` |
 | FITS | yes | yes | U8, U16, F32 | Gray, RGB | no | no | no | no | no | yes (header cards) | no | built in |
 | DPX | yes | yes | U8, U16 (10/12-bit code values read and written exactly through U16) | Gray, RGB, RGBA | yes | no | no | no | no | DPX header fields only (creator, project, copyright, creation time, transfer, colorimetric, frame position, frame rate, time code) | no | built in |
+| Cineon | yes | **no** | U16 (10-bit code values) | Gray, RGB | no | no | no | no | no | no | n/a | built in |
 | AVIF | **no** | only with feature `avif` | U8 | RGB, RGBA | yes | no | no | no | no | no | yes | `image` + `ravif` |
 | HEIF/HEIC | with feature `heif` | **no** | U8, U16 (10/12-bit decodes to U16) | RGB, RGBA | yes (auxiliary alpha) | yes (`colr` prof) | yes | yes | no | no | n/a | `heic-rs` |
 
@@ -93,7 +94,15 @@ embedded table (and a PNG's transparent entry) so `photocraft-io` can open them
   big-endian, one unencoded element, at `EncodeOptions::dpx_bits` (8/10/12/16; by default 8 for
   U8 and 16 otherwise), packing 1 for 10 and 12 bits; gray with alpha is written as luma.
   Other descriptors, signed or run-length-encoded data and other bit depths return
-  `CodecError::Unsupported` naming the field. Cineon (`.cin`) is not supported.
+  `CodecError::Unsupported` naming the field.
+
+* **Cineon (read-only).** Kodak's 10-bit logarithmic film-scan format (the one DPX grew from),
+  read from the same Kodak header family: the generic 1024-byte header, big-endian, one (Gray)
+  or three (RGB) channels, three 10-bit samples packed into each 32-bit word, lines on a word
+  boundary. The 10-bit code values open as U16 `round(c × 65535 / 1023)`; the file's black/white
+  reference points are a log-conversion choice and are not applied. A depth other than 10 bits or
+  a channel count other than 1/3 returns `CodecError::Unsupported`; truncation errors rather than
+  panicking. There is no Cineon writer (`ASYMMETRIC_EXCEPTIONS`); save as DPX, TIFF or EXR.
 
 * **Camera raw files** (DNG, CR2, NEF, ARW… which are TIFF-structured) are recognised and refused
   with `CodecError::Unsupported`: they are sensor data, not flat images. `photocraft-raw` decodes