Legacy ImageMagick Discussions Archive

First, I'm not sure if a 'mask' is the correct operation. Here's what I'm trying to do.

+ I have 2 images. Image1 is color, Image2 is greyscale.
+ The greyscale image has pixel values from 0-255

Using the x,y pixel value of greyscale Image2, I want to darken (or lighten) the same x,y pixel value of color Image1.

Any help would be greatly appreciated!

Please, always provide your IM version and platform when asking questions, since syntax may differ.

Also provide your exact command line and your images, if possible.

See the top-most post in this forum "IMPORTANT: Please Read This FIRST Before Posting" at viewtopic.php?f=1&t=9620

If using Imagemagick 7, then see http://imagemagick.org/script/porting.php#cli


For novices, see

viewtopic.php?f=1&t=9620
http://www.imagemagick.org/script/comma ... essing.php
http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/
https://github.com/ImageMagick/usage-markdown
https://imagemagick.org/script/porting.php#cli


Perhaps what you want is (assuming IM 6)
If on IM 7, use magick rather than convert

See https://imagemagick.org/Usage/compose/#hardlight

Thanks for the quick response! I'll give that a try.

I'm using convert 6.7.8-9 Q16 on linux.

You may need to increase he contrast in image2. One way is -auto-level. Another is -level or -sigmoidal-contrast or -brightness-contrast.