Legacy ImageMagick Discussions Archive

Copying this additional info from me from the bug forum post over here in case someone needs it:

I did some additional testing. This also fails for 12-bit and 14-bit depth TIFF images to JPEG2000. (I'm basically using ImageMagick to do convert image-16b.tif -depth 12 image-12b.tif and so on, then ...

I did some additional testing. This also fails for 12-bit and 14-bit depth TIFF images to JPEG2000. (I'm basically using ImageMagick to do convert image-16b.tif -depth 12 image-12b.tif and so on, then compressing those output images to JPEG2000).

Additionally, using a 12-bit TIFF as input when ...

Bug posted. Thanks. I assume further follow-up will take place on that forum.

Version: ImageMagick 6.9.3-7 Q16 x86_64 2016-03-13 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC OpenMP
Delegates (built-in): bzlib fontconfig freetype jp2 lcms pangocairo png tiff x ...

Something like that would be my conclusion too (note that there shouldn't even be a rounding error, but that's neither here nor there). How would I go about filing a bug report?

That should also not matter, because the original image this came from is also 10 bits, I've never done any bit depth conversion on it.

Testing a bit further, converting the source image to an 8-bit TIFF and then making an 8-bit JPEG2000 file of that gives me a lossless match between the TIFF and ...

Version: ImageMagick 6.9.3-7 Q16 x86_64 2016-03-13 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC OpenMP
Delegates (built-in): bzlib fontconfig freetype jp2 lcms pangocairo png tiff x ...