Created attachment 142779 [details] Example TIFF file Try to insert the attached file to any LibO application. It is taken from http://maptools-org.996276.n3.nabble.com/JPEG-compressed-RGB-tiled-TIFF-with-chroma-subsampling-tp14062p14076.html Original investigation concerned this file: http://forumooo.ru/index.php?action=dlattach;topic=7201.0;attach=12329 Confirmed by kompi already with the forumooo.ru file. Thanks to boud of Krita for help. Boud commented: "krita does support YCbCrA, but other applications will automatically convert it to rgb. But because there are no free ycbcra profiles, we don't ship them. If the user downloads one from somewhere, this image can be loaded without conversion" Arch Linux 64-bit Version: 6.2.0.0.alpha0+ Build ID: 0d2c5e0838906101e1fdea93b4a0c422690e331c CPU threads: 8; OS: Linux 4.16; UI render: default; VCL: kde4; Locale: fi-FI (fi_FI.UTF-8); Calc: group threaded Built on June 15th 2018 Arch Linux 64-bit LibreOffice 3.3.0 OOO330m19 (Build:6) tag libreoffice-3.3.0.4 Version: 6.2.0.0.alpha0+ (x64) Build ID: 90e4c55d01637178418c33ffe818263114a53374 CPU threads: 4; OS: Windows 10.0; UI render: default; TinderBox: Win-x86_64@42, Branch:master, Time: 2018-06-11_23:27:09 Locale: fi-FI (fi_FI); Calc: group threaded
Same problem confirmed on version Version: 6.0.7.3 Build ID: 1:6.0.7-0ubuntu0.18.04.10 @Buovjaga, could you explain more how to work around this bug ?
(In reply to Telek from comment #1) > Same problem confirmed on version > Version: 6.0.7.3 > Build ID: 1:6.0.7-0ubuntu0.18.04.10 > > > @Buovjaga, could you explain more how to work around this bug ? I don't know how to work around this bug.
I don't think this is a colorspace issue. For a quick test, I used imagemagick to generate ten TIFF files with the various compression options via this command: > for i in None BZip Fax Group4 JPEG JPEG2000 Lossless LZW RLE Zip; do magick rose: -format tiff -resize 300% -compress $i rose_"$i".tiff; done The resultant files had the following colorspaces: rose_BZip.tiff sRGB rose_Fax.tiff Gray rose_Group4.tiff Gray rose_JPEG2000.tiff sRGB rose_Lossless.tiff sRGB rose_RLE.tiff sRGB rose_JPEG.tiff sRGB rose_LZW.tiff sRGB rose_None.tiff sRGB rose_Zip.tiff sRGB All but the zip and jpeg versions were able to be imported into a LibreOffice document. Those two gave the "Unknown image format" error. If I convert them to YCbCr or CMYK colorspace, they still don't open, but an uncompressed version in that colorspace will.
The pb is JPEG compression isn't taken into account in LO. Now after reading https://en.wikipedia.org/wiki/TIFF, and this part specifically: "TIFF is a complex format, defining many tags of which typically only a few are used in each file. This led to implementations supporting very varying subsets of the format, a situation that gave rise to the joke that TIFF stands for Thousands of Incompatible File Formats", it's understandable... IMHO, we should use a lib like libtiff to deal with tiff files but it still requires lots of work (see comments in https://gerrit.libreoffice.org/c/core/+/133108) *** This bug has been marked as a duplicate of bug 94372 ***