ppmfade

Generate a transition between two PPM images. More information: https://netpbm.sourceforge.net/doc/ppmfade.html.

ppmfade -f path/to/image1.ppm -l path/to/image2.ppm -mix|spread|shift|relief|oil|...

ppmfade -f path/to/image.ppm -mix|spread|shift|relief|oil|...

ppmfade -l path/to/image.ppm -mix|spread|shift|relief|oil|...

ppmfade -f path/to/image1.ppm -l path/to/image2.ppm -mix|spread|shift|relief|oil|... -base base