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Posted: Tue Feb 25, 2014 3:27 am
by omniplex
In the SourceForge JPEG project (a source code collection of various JPEG libraries) somebody published a test file SignedShortLosslessBug.jpg. Sadly XnView can't handle this, the Windows photo viewer also hates it.

FFmpeg 2.1.3 accepts the test picture and can convert it into a PNG. FFprobe 2.1.3 claims that this image uses pix_fmt=gray16le, and XnView confirms this theory for the PNG, i.e., I get the usual "too many bits per color reduced to 8 bits" warning when I look at the gray PNG. Eventually I tested the 64bit version of nconvert -fullinfo, and got Error: Contact your dealer. Done :D

Re: SignedShortLosslessBug.jpg

Posted: Fri Feb 28, 2014 11:04 am
by xnview
yes lossless jpeg not supported

Re: SignedShortLosslessBug.jpg

Posted: Sun Mar 02, 2014 12:06 am
by omniplex
xnview wrote:yes lossless jpeg not supported
MediaWiki also hates this beast (not sure what they really use, presumably GIMP or Magick), I parked both versions in the Commons JPEG artefacts category.