Quick comparing two images for differences in VB.NET

In VB.NET, I have a source image and a reference image that I want to compare and identify the differences. The two images are jpegs so the pixels can differ slightly while still being basically the same. I'm trying to determine how alike the two pictures are, e.g. are the 95% identical, or 10% identical etc.

I know how to loop through the image doing GetPixel() and comparing the results, but that is pretty slow for large images especially when you have to process the pixels to determine "how different" they are as opposed to just comparing them.

Does anybody have any ideas/tricks that can do this in a faster way?
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Frosty555Asked:
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c_hubbardCommented:
Why not sample a % of the pixels in the image rather than reading all of them.

How are you comparing pixels?
  You could average (Math.abs(R1-R2)+Math.abs(G1-G2)+Math.abs(B1-B2))/255//3 over all the pixels.
 
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Frosty555Author Commented:
Well that certainly sped things up to what I needed it to be at. Thank you!
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