I have black and white images (see below). How count white and black pixels (as example 30% black and 70% white, or 123456 black pixels and 39393 white pixels)?
p.s. I work in linux, what i must use? imagemagick? i prefer a command line interface program.
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Answer
You can use ImageMagick’s histogram function to get a pixel count for each color in the image. Using your image as an example:
$ convert XPH7c.gif -define histogram:unique-colors=true > -format %c histogram:info:- 153985: ( 0, 0, 0,255) #000000 black 182138: (255,255,255,255) #FFFFFF white
So, your image has 153985 black pixels, and 182138 white pixels.