Legacy ImageMagick Discussions Archive

Btw, thresholding the composite mask works as expected:

convert -size 1x265 gradient: -flip \
\( -clone 0 -sigmoidal-contrast 8x50% \) \
\( -clone 0 -threshold 50% \) \
-composite imtest3.tif

http://gnidam.net/files/imtest/imtest-graph3.jpg

...so midtones in the mask don't have any effect ...

Hi all,

until version (Linux) Version: ImageMagick 6.8.9-10 Q16 x86_64 2015-03-03
Features: DPC Modules OpenMP

using a gradient mask this way:

convert -depth 16 -size 1x4096 gradient: -flip -write mpr:gradient \
\( mpr:gradient -sigmoidal-contrast 8x50% \) \( mpr:gradient \) \
-composite ...

Version: ImageMagick 6.7.5-3 2012-02-07 Q16 / Arch Linux (64bit)
Features: OpenMP HDRI

Problem's gone, 16bit TIFFs come out fine again.
Thank you! Martin

Same problem here with 16-bit TIFFs (garbled output for above rose3.tiff and rose4.tiff)
on Arch Linux (64bit):
Version: ImageMagick 6.7.5-2 2012-02-06 Q16
Features: OpenMP HDRI

Problems seem to be starting from version 6.7.4.7 onwards,
6.7.4.6 seems fine...

Thx! Martin