Re: Composing a darker image
Re: Composing a darker image
- Subject: Re: Composing a darker image
- From: Julien Guimont <email@hidden>
- Date: Fri, 22 Aug 2003 13:38:37 -0300
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Message: 8
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Date: Fri, 22 Aug 2003 16:43:31 +0200
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Subject: Composing a darker image
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From: Tito Ciuro <email@hidden>
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To: email@hidden
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Hello,
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I need to draw a darker image of a given TIFF-based image. The lighter
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version was easy:
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[image compositeToPoint: NSMakePoint(iconStatesRect.origin.x,
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iconStatesRect.origin.y)
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operation: NSCompositeSourceOver
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fraction: 0.5];
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A fraction of 1.0 represents the original picture, but I need to darken
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the image a bit, just the way an icon reacts to a click on a toolbar,
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for example. How can I do this?
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Thanks,
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-- Tito
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Hello,
It is fairly easy to do by choosing the right compositing operation. You can use the composite darker and composite lighter if you want (refer to NSImage documentation for informations on operations. You can also download the Composite Lab sample form Apple dev site to get an idea use the result composite operation).
Have a nice day!
Julien Guimont
email@hidden
www.juggysoft.com
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