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Block Processing For Large Images

May 14, 2014 at 2:24 PM
Edited May 14, 2014 at 2:26 PM
Is there some type of block processing in IM so I can handle very large images? See link for details

I'm trying to Canny process a 400 DPI image 16800 x 12000 pixel, 1bpp, Group IV compressed image and it takes a long time. Actually I'm not sure it will complete because I'm too impatient. I've waited 5 minutes and killed it because it just was taking too long. So I was wondering if there was a way I could process a block at a time, show the results, then move to the next block.

Here's link to the file

May 15, 2014 at 8:57 PM
I used image.GetReadOnlyPixels to 'Clone' parts of the image but I am unable to reproduce the code from the posted example. I think you will have to do some trials for yourself to see if you can get it working.