Some TIFFs can't be exported to PNG in Preview. What is preventing this and how do I correct it?
1 Answer
This happens when the image is in CMYK.
PNG does not support the CMYK color mode therefore Preview won't suggest it for the export.
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1This is not possible in preview directly. Maybe the script suggested on SuperUser might interest you : superuser.com/a/117489/95841 Sep 23, 2013 at 11:04