Re: My thoughts on image spam strategies

[Matthias Keller]

will it not be much faster just to make a md5 sum on the image file 
without
thinking if it a appel or orange ? :-)
Yes, but just taking a straight sum will be sensitive to all of those 
small pixels which are changed by the spammers so that they have 
different sums, but the differences aren't visible to the human eye.

That's my point.  If you drop out the lower bits of the colors, then 
you mostly retain what is perceptible (in color ranges) to the human, 
while losing those parts that a) the human wouldn't have noticed 
anyway, and b) throw off your sum of the image for comparison to known 
spam images.
Hi

You're idea is kinda interesting, but what would you do about a pic with 
white background, black font and some random black noise on it ?


Matt