These files carry no JPEG: their preview is an uncompressed 8-bit RGB
IFD (1217 x 913 in the H4D-40 FFF, 218 x 218 in the CFV 3FR). The
largest such image is handed on by embedded_preview as a small baseline
TIFF, which lightcraft_codecs::decode reads, so 3FR / FFF show a preview
in the grid and loupe before they are developed. No Orientation tag is
written: the raw file's applies, as for JPEG previews without one. The
FFF's 16-bit copy (with a TransferFunction of unknown meaning) is not
used.
decode_raw_preview applied a container-declared colour space by forcing
the JPEG decoder on any owned preview; it now checks for JPEG bytes, so
a wrapped TIFF (or a JPEG XL preview) goes to its own decoder.
Checked on the CC0 H4D-40 FFF and CFV 3FR through
embedded_preview_srgb: right colours, the 3FR upright through its
Rotate90. Tests cover the wrap, the choice among RGB images, a short
strip and truncated files.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J2NDVXA8jQQWeJb4YVTb6b
Claude
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