GIMP

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Download the scripts. These layer effects work with decomposition layers and multiplification layers. The tarball contains both scripts.

def layer_effect_exemplification(image, drawable):

    pdb.gimp_image_undo_group_start(image)
    image, layer_value = pdb.python_fu_decompose_value_layer(image, drawable)
    image, layer_red = pdb.python_fu_decompose_to_layer_red(image, drawable)

    pdb.gimp_layer_set_mode(layer_red, MULTIPLY_MODE)
    pdb.gimp_equalize(layer_red, False)

    pdb.gimp_image_undo_group_end(image)

files related to subject

• this script and more
• manually make the effect
• other multiplication layer effects
• unnamed layer effects
• layer effects
• more about the decompose filter
• Hand Edited The Longest Fjord
• Auto Exemplified Fjord