GIMP

download

Download the script. Also, the simple difference layer effect is not a long read:

def layer_effect_laplace_grain_merge(image, drawable):
    layer_copy = pdb['gimp-layer-copy'](drawable, True)
    pdb['gimp-image-add-layer'](image, layer_copy, 0)
    pdb['gimp-desaturate'](layer_copy)

    drawable_copy = pdb['gimp-layer-copy'](drawable, True)
    pdb['gimp-image-add-layer'](image, drawable_copy, 0)
    pdb['plug-in-edge'](image, drawable_copy, 2.0, SMEAR, LAPLACE)
    pdb['gimp-desaturate'](drawable_copy)
    pdb['gimp-layer-set-mode'](drawable_copy, GRAIN_MERGE_MODE)

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