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Re: OR compositing operation?

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Re: OR compositing operation?

Subject: Re: OR compositing operation?
From: David Duncan <email@hidden>
Date: Tue, 22 Sep 2009 09:23:37 -0700

On Sep 22, 2009, at 6:22 AM, Oleg Krupnov wrote:

Hi,

I'd like to draw in a graphics context in such a compositing mode:

R = MAX(S, D)

i.e. out of two colors (source and destination), the maximum color
(channel-wise) was chosen. This is basically equivalent to ORing the
colors.

This is the Lighten blend mode (kCGBlendModeLighten). There doesn't appear to be a corresponding NS composting mode, and I'm not sure why, but you can easily get a CGContext from an NSGraphicsContext by asking it for its graphicsPort, so this shouldn't be hard to integrate. -- David Duncan Apple DTS Animation and Printing

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