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NSColor opacity

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NSColor opacity

Subject: NSColor opacity
From: Ken Tozier <email@hidden>
Date: Mon, 29 Jan 2007 23:18:26 -0500

Hi

I'm drawing an NSColor to a custom view and am having problems with the opacity of the color. Intuitively, I would think that setting an alpha of .1 to an RGB color would produce a 10 percent color screen but it doesn't. What happens is that the color approaches black as the alpha decreases when logic would conclude it should approach transparent. I can make a lighter screen by setting a high opacity (, 8, .9) but this obscures the underlying image more not less.

How do you do something like this?

Thanks for any help

Ken
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