[racket-dev] Adding alpha to color%

From: Noel Welsh (noelwelsh at gmail.com)
Date: Wed Nov 24 12:28:33 EST 2010

Hi all,

Why was the alpha channel made a property of the dc, rather than (in
addition to) the color? For some use cases specifying alpha as part of
the colour is more convenient, and Cairo supports both IIRC. (That is,
you can specify alpha as part of a color or as part of the drawing


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