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Page.CMYKProfile returns the ICC profile RenderCMYK draws a page in: the caller's, or that of the output intent of the page or the document; nil for the bundled SWOP, which is a table, not a profile. The intent's profile is decoded again when asked for, not kept. cera -cmyk draws with RenderCMYK into a TIFF of CMYK samples that carries that profile (calamus' TIFF encoder writes *image.CMYK as separated samples and embeds profiles).
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Follow-up of #209 / #235.
Page.CMYKProfile() []byte: the ICC profileRenderCMYKdraws the page in — the caller's (OpenOptions.CMYKProfile), or that of the page's or the document's output intent; nil for the bundled SWOP (a table, not a profile),NaiveCMYK,IgnoreOutputIntent, or an intent profile cera cannot use. The intent profile is decoded again on request, not kept in memory.cera -cmyk -o 'press-%d.tif' in.pdf:RenderCMYKinto a TIFF of CMYK samples carrying that profile. Refused with-gray,-transparentor a non-TIFF output.Draft:
cmd/cerapoints at calamus PR timzifer/calamus#36 (pseudo-versionbd50c16); switched to the calamus tag once #36 is merged and tagged.Checked: a corpus page written with
-cmykreads in Pillow (libtiff) as CMYK, black text on K only, with the 54 kB profile given by-cmyk-profile; tests for the profile choice (intents of page over document, caller's, naive, ignored, bundled, unusable profile) and for the TIFF tags.