QUOTE(Martyr2 @ 1 May, 2008 - 11:48 AM)

I find it pretty reasonable if the number is 82372. I am not sure how strong it would be against the bots since the only white on the image is pretty much the number (and yeah the line but still). You may want to add some kind of warping effect on the numbers which is harder to calculate. Think what would happen if they took the image and threw away color information and made it greyscale. The number sticks out like a sore thumb.
Just a few things to consider.

here is the thing. an OCR reader does several things.
1. Removes backgrounds and small lines
2. Segments out the image based on where it reads a letter stops(why i put the gold OCR in the backgroup)
3. Grabs the interpreted letters from the segmented parts. So even if you warp the numbers an OCR reader can still read them. What has to happen is there needs to be some overlap where the OCR reader cant distinguish where one letter stops and the other begins. Thus rendering it incapable of segmenting the image.