Color to Alpha

Just Someone · **Joined:** Mar 21, 2014 **Posts:** 5

Hello
I'm new around here and looking for some help. I'm trying to figure out how to take a folder and sub-folders with images of .tga files and just add color to alpha black to each image and then just save it. I have thousands of images to do and I can't do them one at a time.

This is what I do now.
open file *.tga
Layer/Transparency/Color to Alpha (black) press OK
File/Overwrite *tga

Any help is greatly appreciated.

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4812

Use ImageMagick:

http://www.fmwconcepts.com/imagemagick/ ... ransparent

saulgoode · **Posted:** Fri Mar 21, 2014 7:07 pm **(#3)**

What OS are you using?

Just Someone · **Joined:** Mar 21, 2014 **Posts:** 5

Win 7 64bit

saulgoode · **Posted:** Fri Mar 21, 2014 7:45 pm **(#5)**

Sorry, I will have to get back to you tomorrow. Something's come up that I need to deal with.

saulgoode · **Posted:** Sun Mar 23, 2014 1:42 pm **(#6)**

The following script will perform a color to alpha on all .tga files in the current directory and all of its subdirectories. All such files will be overwritten so working on a copy of the directory tree is advised.

http://chiselapp.com/user/saulgoode/rep ... 9aa874d798

Just Someone · **Joined:** Mar 21, 2014 **Posts:** 5

Thank you for the help.

I have tried running the script and it looks like it is doing something but when I check the files nothing has changed. The files are not even overwritten so I'm not sure what is going on or what I am doing wrong.

I put the script into the scripts folder C:\Users\name\.gimp-2.8\scripts
Open gimp
Open Gimp / Filters / Misc / Process TGA Files...

Find the folder I need to process and press OK.

It looks like it is processing files but nothing seems to be happening when I go back and check the files after it finishes.

So I'm not sure what I am missing.

Thanks again for the help.

saulgoode · **Posted:** Tue Mar 25, 2014 5:20 pm **(#8)**

It is unclear to what extent transparency is supported in TGA files. It is apparently not part of the baseline specification but is added by some applications in a proprietary "chunk".

If you want me to modify the script to output PNG files instead, I will do so; but I am not interested in writing code to support any proprietary formats.

Just Someone · **Joined:** Mar 21, 2014 **Posts:** 5

If trying .png files is just changing tga to png I have tried that with the same results.

It looks like its running doing something but I have yet to figure out what it is doing because I have not found any files the script changes.

saulgoode · **Posted:** Wed Mar 26, 2014 12:19 am **(#10)**

Oops, a silly mistake on my part. Try the following version.

http://chiselapp.com/user/saulgoode/rep ... 95d2768b51

Just Someone · **Joined:** Mar 21, 2014 **Posts:** 5

That is perfect I thank you 1000x.