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- A PANTONE (colour-book) ink is stored by its book key, so it read as black: Photoshop's usual Black + PANTONE duotones showed, exported flat and converted to RGB much darker than the grey plate before. Photoshop writes every ink's Lab equivalent in resource 1066; it now gives the ink its colour. Without it, the grey plate is shown, as before. - Ink colours go through channel_map::decode_known_color (HSB inks were black with a "colour book" warning; CMYK is colour-managed). - Photoshop has only 8-bit Duotone and refuses to open a 16-bit Duotone PSD: a 16-bit Duotone is written as Grayscale with the warning again. - A curve on the 13-point grid without a 0 % or 100 % point was written with -1 there, which Photoshop refuses to open: both ends are filled. - A layered TIFF of an Indexed, Bitmap or Duotone document says it is written in its pixel format (CodeRabbit's thread at tiff_layers.rs). Co-authored-by: Gert Pellin <8284204+switch87@users.noreply.github.com> Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>