Blur, change mode, save as

[Ofnuts]

In modern programming languages looping is simple

Code:

for blur in [10,20,30,40]:
   outputFile="%s-%02d.png" % (rootName,blur) # Possibly a bit more complex than this
   blurImage=image.duplicate() # Temporary copy
    pdb.gimp_image_undo_disable(blurImage) # Disable undo
   layer=blurImage.activeLayer
   pdb.plug_in_gauss_iir(blurImage, layer, blur, True,True)
   pdb.gimp_drawable_posterize(layer,5)
   pdb.file_png_save_defaults(image, layer, outputFile, outputFile) # Other calls possible with more options
   gimp.delete(blurImage) # Throw away this copy