Search found 3 matches

by jont
2017-09-10T01:17:35-07:00
Forum: PerlMagick
Topic: Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)
Replies: 4
Views: 12938

Re: Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)

Yes, I'm just getting a completely opaque image with CopyOpacity. I'm running a very old version of Image Magick currently (6.86), because I've been unable to get a more recent version working with the combination I'm using of XAMPP/Apache/mod_perl/ActivePerl/ImageMagick without having to build my o...
by jont
2017-09-09T13:54:19-07:00
Forum: PerlMagick
Topic: Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)
Replies: 4
Views: 12938

Re: Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)

Thanks for that, but as I understand it, that will copy the alpha mask from one image into another. What I need to do is use a greyscale image as an alpha mask, or is there some trick I'm missing here?
by jont
2017-09-09T01:50:29-07:00
Forum: PerlMagick
Topic: Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)
Replies: 4
Views: 12938

Convert greyscale image to alpha channel (opposite of Separate for channel=>Alpha)

I'm trying to extract an alpha channel as a greyscale image, manipulate it, and then either apply the greyscale image to the alpha channel on another image, or use the greyscale image as an alpha mask for a Composite operation. I'm extracting the alpha channel as a greyscale image with something eff...