BMP bitmaps are seen as RGB, lose transparency and cannot be coloured in 28.5
Place a .BMP 1 bit file in AI 28.5. It is seen as RGB and cannot be coloured.
PSD and TIF bitmaps work fine.
See the recent answers in these posts: https://community.adobe.com/t5/illustrator-discussions/assign-spot-color-to-bitmap-no-longer-works/td-p/13138271
https://community.adobe.com/t5/illustrator-discussions/bitmap-issues-with-illustrator-28-5/m-p/14619511#M407603
Ton
shared this idea
The bug seems to be fixed in Beta 28.7.0.65
Please try to update and verify if it now works as intended for you.
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Massimo
commented
I had the same problem. I updated to the 28.7.2 and now it works. Thanks
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Works also in Prerelease 28.7
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Christy, 28.7 (or 28.8 now) — is the Beta build. It is available in Creative Cloud Desktop application under Apps, Beta Apps.
You can either wait until the change gets pushed to the stable channel, or try to install Beta. -
christy hawkins commented
I have 28.6 and I'm having the same problem. I don't see how to upgrade to 28.7
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Josh Staples
commented
I'm having an issue with the latest Illustrator using placed / embedded .EPS files that are in bitmap mode (decades worth of .AI files with placed and embedded .EPS files, pen and ink drawings mostly). The preview is very off - inverted or just corrupt-looking nonsense - and the fix of Object > Image Trace is not producing the nice results I'm used to.