Difference Clouds command changes colors partially in cloud-like areas: The filter renders Solid Noise cloud in an automatically created new layer, and sets the layer mode to Difference, then merges this layer over the specified image.

Se a imagem for em cores indexadas, este item do menu se torna cinza e indisponível.

This filter is found in the image window menu under Filters → Render → Noise → Difference Clouds….

This script has no options.