ppmfade
Generate a transition between two PPM images. tldr-pages
On several platforms
Several platforms
Generate a transition between two PPM images (first and last) using the specified effect
ppmfade -f path/to/image1.ppm -l path/to/image2.ppm -mixIdentifyGenerate a transition starting with the specified image and ending in a solid black image
ppmfade -f path/to/image.ppm -mixIdentifyGenerate a transition starting with a solid black image and ending with the specified image
ppmfade -l path/to/image.ppm -mixIdentifyStore the resulting images in files named base.NNNN.ppm where NNNN is an increasing number
ppmfade -f path/to/image1.ppm -l path/to/image2.ppm -mix -base baseIdentify