https://bugs.documentfoundation.org/show_bug.cgi?id=158293
--- Comment #6 from Patrick Luby <plub...@libreoffice.org> ---
I can reproduce this bug in my local build as well as in LibreOffice 7.5.8.2.
Not sure if it helps, but I have located where in the code the embedded image
is loaded into a SalBitmap. The image is a grayscale JPEG image 386x553 pixels
in size that is copied directly into a SalBitmap with a 256 entry color
palette.
Frame #9 in the following stack snippet is where GraphicFilter::readJPEG()
copies the loaded pixels to a SalBitmap. I am not familiar with parsing JPEG
image files but my first guess is that LibreOffice's JPEG parsing code is
setting the wrong grayscale palette:
frame #9: 0x000000011590c15c
libvcllo.dylib`GraphicFilter::readJPEG(rStream=0x0000600012206080,
rGraphic=0x000000016fdf7710, rLinkType=0x000000016fdf7438,
nImportFlags=SetLogsizeForJpeg) at graphicfilter.cxx:976:33
frame #10: 0x0000000115907ecc
libvcllo.dylib`GraphicFilter::ImportGraphic(this=0x0000000116329338,
rGraphic=0x000000016fdf7710, rPath="", rIStream=0x0000600012206080, nFormat=6,
pDeterminedFormat=0x000000016fdf75d6, nImportFlags=NONE) at
graphicfilter.cxx:1336:23
frame #11: 0x000000010f30c144 libsvxcorelo.dylib`(anonymous
namespace)::SvXMLGraphicOutputStream::GetGraphic(this=0x000060001b40c180) at
xmlgrhlp.cxx:295:43
frame #12: 0x000000010f30bf00
libsvxcorelo.dylib`SvXMLGraphicHelper::loadGraphicFromOutputStream(this=0x00000003710d2290,
rxOutputStream=0x0000000129f68c98) at xmlgrhlp.cxx:612:46
frame #13: 0x000000011c3b7368
libxolo.dylib`SvXMLImport::loadGraphicFromBase64(this=0x0000000387238e50,
rxOutputStream=0x0000000129f68c98) at xmlimp.cxx:1333:45
frame #14: 0x000000011c571a64
libxolo.dylib`SdXMLGraphicObjectShapeContext::endFastElement(this=0x0000000129f68ac0,
nElement=328674) at ximpshap.cxx:2407:64
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