Hi, A quick check tells me tiffcp does suffer from this bug:
> ~/Documents > ❯ tiffcp -c jpeg -r 16 ./libtiff/test/images/quad-lzw-compat.tiff > /tmp/test.tif > LZWPreDecode: Warning, Old-style LZW codes, convert file. > > ~/Documents > ❯ tiffinfo /tmp/test.tif > === TIFF directory 0 === > TIFF Directory at offset 0x5b6e (23406) > Image Width: 512 Image Length: 384 > Position: 0, 0 > Bits/Sample: 8 > Compression Scheme: JPEG > Photometric Interpretation: YCbCr > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 3 > Rows/Strip: 16 > Planar Configuration: single image plane > Reference Black/White: > 0: 0 255 > 1: 128 255 > 2: 128 255 > JPEG Tables: (574 bytes) > > ~/Documents > ❯ tiffcp -c jpeg:r -r 16 ./libtiff/test/images/quad-lzw-compat.tiff > /tmp/test.tif > LZWPreDecode: Warning, Old-style LZW codes, convert file. > > ~/Documents > ❯ tiffinfo /tmp/test.tif > === TIFF directory 0 === > TIFF Directory at offset 0xb8ce (47310) > Image Width: 512 Image Length: 384 > Position: 0, 0 > Bits/Sample: 8 > Compression Scheme: JPEG > Photometric Interpretation: RGB color > Orientation: row 0 top, col 0 lhs > Samples/Pixel: 3 > Rows/Strip: 16 > Planar Configuration: single image plane > JPEG Tables: (289 bytes) > > ~/Documents > ❯ tiffcp --version > tiffcp: illegal option -- - > LIBTIFF, Version 4.4.0 > Copyright (c) 1988-1996 Sam Leffler > Copyright (c) 1991-1996 Silicon Graphics, Inc. Looks like it's really really /really/ old, the interpretation was set here: https://gitlab.com/libtiff/libtiff/-/commit/cbc821458661bed9ab092568a556ffeaa065ab8d Also, using `tiffcrop` here errors out consistently with: > libtiff on master [!] via C v13.0.0-clang via △ v3.25.2 > ❯ ./build/tools/tiffcrop -c jpeg:raw -r 16 > ./test/images/quad-lzw-compat.tiff /tmp/test.tif > LZWPreDecode: Warning, Old-style LZW codes, convert file. > JPEGSetupEncode: RowsPerStrip must be multiple of 8 for JPEG. > /tmp/test.tif: Error, can't write strip 0. > : Unable to write contiguous strip data for page 0. Tiffcrop overrides whatever the user sets with the -r flag, so there's no way to tell it to use a more appropriate strip size: https://gitlab.com/libtiff/libtiff/-/blob/master/tools/tiffcrop.c#L7020 Best, amyspark On 06/02/2023 21:34, miguel medalha wrote: > 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. > > _______________________________________________ > Tiff mailing list > Tiff@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/tiff -- amyspark 🌸 https://www.amyspark.me _______________________________________________ Tiff mailing list Tiff@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/tiff
