Question

I need to compare parts/sections of two images using RMagick (Ruby binding for ImageMagick). Has anyone had anything to do with it.

I am using compare_channel method to generate the image! I have read up the RMagick docs and the RMagick examples from the docs and I get the feeling that I could use
mask somehow, but not sure how?

Any ideas?

Answer 1

Comparing the results of Image#export_pixels_to_string should do the trick:

area1_str = image1.export_pixels_to_string(xpos, ypos, width, height)
area2_str = image2.export_pixels_to_string(xpos, ypos, width, height)
if area1_str == area2_str
  puts "Equal"
else
  puts "Different"
end