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Re: NSImage Gradient Mask

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Re: NSImage Gradient Mask

Subject: Re: NSImage Gradient Mask
From: George Orthwein <email@hidden>
Date: Wed, 24 May 2006 11:28:29 -0400

I think NSCompositePlusDarker is the mode you want with an opaque black to white gradient and assuming a black background.

CompositeLab is helpful but it doesn't take two images or allow you to specify a gradient. Is there an updated version of this somewhere? I suppose it would be easy enough to modify.... /Developer/Examples/AppKit/CompositeLab/

You also may want to have a look at CTGradient to draw the gradient in code: http://blog.oofn.net/projects/misc

And the ultimate approach would be to apply transparency to the image so that it can float over any type of background. Off the top of my head, you'd probably need to: - generate a gradient from any opaque color to any transparent color. - composite with original image as the source using NSCompositeSourceIn

Hope that helps,
George
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References:  
  >NSImage Gradient Mask (From: Jerry Brace <email@hidden>)




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