Merging images, applying color saving in color and in black & white?

[tudvari]

I'm making achievements for my game, and I would like to make an automated process to save a lot of time instead of doing it manually.

So I'd like to make a GIMP script doing this for me But I'm complete noobie with it. Could you help me please?

The inputs of this process would be

• one rectangular opaque background image (i.e. 200x200 PNG)
  

• Color A, (i.e. in hex)
  

• Color B, (i.e. in hex)
  

• and multiple same sized, rectangular, transparent foreground images. (i.e. 200x200 PNG)
  

And the process would do this for every foreground image:

1.  Start with the background image.
   
2.  Merge the foreground image with Color A filter applied, and also with an offset from the middle.
   
3.  Merge the foreground image with Color B filter applied, in the middle.
   
4.  Save the result in a file.
   
5.  Apply a black & white filter and save the result in a file.
   

So the output would be for example multiple 200x200 PNG images, each of it having a colored and a black & white version

Could you help me please?