To asnwer your question - yes, I want to detect edges without decompression. I realize that this is not going to be very accurate. However, I'm not going for accurasy, I'm going for crude functionality and SPEED.

I have done research in the past, and I know that detection without decompression is possible for JPEGs (see here) JPEGs are much more involved in encoding. If it's possible to do edge detection with JPEGs, I only assume that it is also possible to do it with GIFs since that encoding algorithm is MUCH simpler.

In reply to Re: Re: GIF Image Processing by gri6507
in thread GIF Image Processing by gri6507

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