Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Is there a way to do it without sacrifices?

share|improve this question
    
    
Why use gimp at all? There are better suited programs for this. –  TheZ Aug 8 '12 at 21:28
    
The only program which has easy way to do this is Nuke. Also, with some hard dances it is possible in paintnet. But one does not simply install paintnet on mac. –  user1038085 Aug 8 '12 at 21:31
2  
It seems that "Colors -> Color To Alpha" should do the trick if you set the color to ff0000. –  S. Albano Aug 8 '12 at 21:35
    
I will answer so as to get credit, and not have it in the unanswered tab. :) –  S. Albano Aug 8 '12 at 23:49
add comment

migrated from stackoverflow.com Aug 9 '12 at 16:39

This question came from our site for professional and enthusiast programmers.

2 Answers

It seems that "Colors -> Color To Alpha" should do the trick if you set the color to ff0000.

share|improve this answer
add comment

This does the job well:

Colors->Compose->Decompose

  • Set Color Model to RGBA
  • Uncheck "Decompose to layers" - my personal preference
  • OK

Colors->Compose->Recompose

Swap the RED and ALPHA channels

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.