Am Freitag, den 05.06.2009, 19:24 +0800 schrieb chunlong84:
>                               
> I have tried your method,but the line color is still different from the pixel 
> get from the .png picture on the window.
> Below is the code:

Maybe gamma correction is at play?  PNG has this capability.

If that's not it, a self-contained test case would make it easier for
interested people to take a look at the problem.

--Daniel


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