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Re: Transparency with PNG on NSImageView
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Re: Transparency with PNG on NSImageView


  • Subject: Re: Transparency with PNG on NSImageView
  • From: Damien Cooke <email@hidden>
  • Date: Fri, 6 Feb 2009 09:32:33 +1030

Thanks David,
I am not sure that this will work for me in this instance as the smaller image needs to be in a NSImageView so I can drag n'drop other images in there.


Regards
Damien

On 06/02/2009, at 9:22 AM, David Blanton wrote:

I do this to composite one image over another:

	CGContextRef ctx = UIGraphicsGetCurrentContext();
	CGContextClearRect(ctx, rect);
	CGContextDrawImage(ctx, rect, _meterImages[0]);
	CGContextSetBlendMode (ctx, kCGBlendModeNormal);
	CGContextDrawImage(ctx, rect, _meterImages[1]);

(iPhone example but the only difference I think is UIGraphicsGetCurrentContext)


On Feb 5, 2009, at 3:28 PM, Damien Cooke wrote:

Hi All,
I have what is probably a stupid problem. In my window I have a background NSImageView and I want to pop another much smaller one on top. The one I am putting on top is a png with transparencies. When I do this I get a rectangular image over my background but what I want to see is only the non transparent parts of my image. I have set the background colour of my image via [image setBackgroundColor:[NSColor clearColor]] but I am perplexed with the spectacular lack of any change.


I feel I am completely on the wrong path. Can someone point me in the right direction?

Regards
Damien


If you can't be kind, at least have the decency to be vague.



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David Blanton






If you can't be kind, at least have the decency to be vague.



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References: 
 >Transparency with PNG on NSImageView (From: Damien Cooke <email@hidden>)
 >Re: Transparency with PNG on NSImageView (From: David Blanton <email@hidden>)

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