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0.99.6: JPEG mode cannot be used when 32bit PNG is converted to TIFF

Posted: Fri Jan 07, 2022 7:27 pm
by Mapaler
0.99.6 64bits
Win10 21H2

This is what I discovered in the process of researching the TIFF format. This photo happened to be saved as a 32-bit PNG.

Convert a 32bit to TIFF, and set JPEG mode.
图像 5.png
图像 5.png (7.23 KiB) Viewed 2158 times
Will be converted to an uncompressed TIFF.( Left )
However, after converting to 24-bit PNG, JPEG compression can be successfully performed. ( Right )
图像 4.png

Re: 0.99.6: JPEG mode cannot be used when 32bit PNG is converted to TIFF

Posted: Sun Jan 09, 2022 3:08 pm
by xnview
TIFF only support JPEG compression on 24bits image