Pixelmator 4bit color depth

[appleii.c]

Does anyone know if there is a way to set the color depth of an image to something lower than 8 bit in pixelmator? I've been looking all morning and do not see that this is possible. If not, can you recommend an alternative (other than Photoshop). Possibly Affinity Photo or other.

Thanks in advance for your help!

 

[rudo.ba]

Not possible in Pixelmator, Affinity Photo, Acorn.

Try GIMP:
http://docs.gimp.org/en/gimp-image-convert-indexed.html