> Looking at the docs for region%, Racket doesn't have a simple way to do > this - it still could be done by force and might not be that slow > depending on the complexity of the "scene" in the image. If you're > familiar with image processing, the basic idea is recursive "blob" > identification.
I don't have much background in image processing, but I'll keep this in mind in case the current method becomes untenable at some point. Thanks for the pointer! > I saw in your reply to Matthias that you are "drawing" the pictures into > an offscreen bitmap. I know that word "drawing" is overloaded: did > you mean you loaded a bitmap (from a file?) and made an offscreen copy, > or that you are composing the image with pen/brush. Reason I ask is > that if you are composing, constructing a corresponding region% might be > relatively easy. What I mean is that I'm using draw-pict to cause the contents of a pict to be drawn on a dc<%> that I get from a bitmap%. The bitmap is initialized empty and transparent, and then the pict is drawn to it. I can tell which pixels are affected by the drawing by seeing if they are still transparent. I don't know a good way to get a region% out of that, or even if it would be faster than the current approach. /David -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
