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Re: Simulate Photoshop's "Overlay" compositing method

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Re: Simulate Photoshop's "Overlay" compositing method

Subject: Re: Simulate Photoshop's "Overlay" compositing method
From: Ricky Sharp <email@hidden>
Date: Wed, 6 Jul 2005 22:14:37 -0500

On Jul 6, 2005, at 4:09 PM, adam baker wrote:

I am just wondering if there is a convenient (read: easy, fast, etc.) way of simulating Adobe Photoshop's "Overlay" layer compositing mode. This would essentially be used to tint images.

Whatever solution exists would have to work in Panther as well as later versions of Mac OS X, so anything that's CI-only is out :-/

I'll assume you have an NSImage you're starting with? If so, render the image, set an appropriate tint color and use NSRectFillUsingOperation to fill a particular area.

For example, set a color with a low alpha value and use the NSCompositeSourceOver operation with NSRectFillUsingOperation.

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Ricky A. Sharp         mailto:email@hidden
Instant Interactive(tm)   http://www.instantinteractive.com

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  >Simulate Photoshop's "Overlay" compositing method (From: adam baker <email@hidden>)




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