[racket] problem with get-argb-pixels (or underlying drawing software)

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Thu Nov 29 12:24:26 EST 2012

I usually do that by looking at get-argb-pixels out of a bitmap-dc. If
you're getting bad results at that level, that seems especially
interesting to try to reduce it to something small.


On Wed, Nov 28, 2012 at 10:44 PM, John Clements
<clements at brinckerhoff.org> wrote:
> On Nov 28, 2012, at 5:40 PM, Robby Findler wrote:
>> I think the first step to understanding this is to operate at the dc% level. That is, make a little program that draws (simpler) shapes, cropped and uncropped, via calls directly to the dc object and see if you can find a minimalist program. Well, that's how I tackle these problems, generally.
> One question about this: how do I examine the dc% to see what's in it? It seems that 'get-pixel' doesn't actually produce the correct values....
> John

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