Legacy ImageMagick Discussions Archive

Since revision 13011 (http://trac.imagemagick.org/changeset/13011/ImageMagick/branches/ImageMagick-6/magick/enhance.c), the LevelColorsImageChannel function always returns 0 (MagickFalse). This causes RMagick's level_colors to fail with recent ImageMagick versions (https://github.com/rmagick/rmagick ...

That makes sense, thank you for looking into it. Would it be possible to add support for the ">" and "<" flags to jpeg:size? Then one could do: convert -define "jpeg:size=1500>" in.jpg -resize "1500>" out.jpg Which would mean "only use the libjpeg scaling feature if in.jpg is larger than 1500px ...

I tried using ImageMagick 6.8.2-1 compiled against libjpeg 8d using this sample 800x800 image: http://upload.wikimedia.org/wikipedia/commons/3/32/Koningin_Beatrix_in_Vries.jpg Running the command: convert -define "jpeg:size=1000" Koningin_Beatrix_in_Vries.jpg -resize "1000>" out.jpg produces a ...

I'm using -define "jpeg:size=xxx" to limit memory usage when resizing large JPEG images. I noticed that images smaller that the desired output image can get upscaled despite using the ">" geometry flag. For example: convert -resize "1500>" -define "jpeg:size=1500" in.jpg out.jpg where the size of in ...