This is a very simple script for method of image processing othen used by myself - splitting picture into a two assembled layers: colors and grain. This gives us a very lot of capabilities of changing picture without making a hard artefacts inside it.
You can read more about the script, with a sample of use here:
http://leoblog.ru/?Proekty:Pesni_pro_grafiku:Skript_dlya_GIMP_avtomatizi...
p.s. i'm also add a second version - for a slow machines; it do same thing, but by the little diffrent way. read more »
Slices and joins scriptfu is useful when you want to split one image 'file' into smaller 'files', and to recombine it successively. One single image 'file' can be split into unlimited number of files. Image-slice script save on the file imagename.rcm all the data for the reconstruction.
Bugs fixed and enhancement:
Duplicate file name
Invalid path name (Linux user)
Slice export maintains the transparency.
Add Option in order to recompose all pieces on a layer.
Limited the maximum number of lines and columns to the dimension in pixel of the image.
For more information read more »

Split Studio - is a powerful script for tone image's areas (light/dark) into two different colors (split).
Features:
Revision #4: Now it is Split Studio v3.0r4 read more »
This is my alternative for 'To slice and merge images' (see http://registry.gimp.org/node/14953).
If you haver use this script; download too http://registry.gimp.org/node/60
Two script for:
1. Set width and height rectangle to split and set as separate layer
2. Split in rows and columns and save any rectangular portion in the new layer
Slices and joins scriptfu is useful when you want to split one image 'file' into smaller 'files', and to recombine it successively. One single image 'file' can be split into unlimited number of files. Image-slice script save on the file imagename.rcm all the data for the reconstruction.
Example

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