Batch changing colors in png images?
 

Hi all, and a Happy New Year!

I hope this will be a simple problem for you. I've been doing some DVD authoring stuff, and I've got a large string of 3 and 4-color .png images (subtitles) whose colors are not what I want them to be. I need to find a quick way to switch the colors throughout the batch to different ones, without affecting the overall structure of the image (especially the 4 color limit and alpha transparency), and without having to open them all up individually.

In other words, if the images have color 'A' in them, I want a simple and safe way to change it to color 'B' throughout the whole batch. Is there some way to use GIMP or ImageMagick batch processing or something to do this?

Bump.

I finally discovered how to get the original palette when ripping the subtitles in the first place, but I'd still like to know how to do this so that I can change the colors to better looking ones when I want. Any info? Even just a suggestion as to the best place to look would be appreciated.

You should be able to do it with GIMP. I would try swinging by the GIMP website for help. I don't really know any particulars on how it would work.. sorry.