Thread: Kobo Bug thread
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Old 06-13-2015, 01:06 AM   #627
davidfor
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Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Unfortunately, I can confirm this. But, it seems to only happen with PNG images that have a reduced palette.

I have a test kepub (from DNSB I think) with lots of different things in it. This has six versions of the same image in it. The only one that has a problem is the grayscale PNG with 16 levels. Experimenting with the calibre conversion from a CBR to kepub, if I turn of the image processing, everything is OK. If I have this on and convert to PNG, the images are black.

So, the workaround is to either turn the comic processing off, or convert to JPG.

I have reported this to Kobo with my test case.
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