2023.02.07 00:34 "[Tiff] tiffcrop tool ~ JPEG compression options
produce wrong output", by Miguel Medalha
Thread
2023.02.07 00:34 "[Tiff] tiffcrop tool ~ JPEG compression options produce wrong output", by Miguel Medalha
The tiffcrop is inverting RGB and YCbCr output when using jpeg compression.
The stated YCbCr default (no format specified) works correctly:
'tiffcrop -c jpeg infile.tiff outfile.tif' the output is a YCbCr file (default behavior)
'tiffinfo outfile.tif' 'Photometric Interpretation: YCbCr'
But if we request a specific mode using the proposed 'rgb' and 'raw' jpeg options:
'tiffcrop -c jpeg:raw infile.tiff outfile.tif' the output is a RGB file
'tiffinfo outfile.tif' 'Photometric Interpretation: RGB color'
'tiffcrop -c jpeg:rgb infile.tiff outfile.tif' the output is a YCbCr file
'tiffinfo outfile.tif' 'Photometric Interpretation: YCbCr'
When we request RGB a YCbCr file is produced, when YCbCr is requested a RGB file is produced.
This has been reported 2 years ago as Issue #228, but still not addressed. Is this considered of lesser importance? I would certainly fix it if I knew how to do it...
I know that the work on libtiff is voluntary, which I very much appreciate and am grateful for. I just thought I would leave a reminder here, in case the issue had just been inadvertently buried in time.
tiffcp does not suffer from this drawback.