basic bitmap storage
Useful for comparing two JPEG images saved with a different compression ratios.

You can use these pictures for testing (use the full-size version of each):



50% quality JPEG

100% quality JPEG







link to full size 50% image

link to full size 100% image

The expected difference for these two images is 1.62125%

   require 'media/image3'
   'Lenna50.jpg' (+/@,@:|@:- % 2.55 * */@$@])&read_image 'Lenna100.jpg'
1.62559