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HTML Canvas - drawing images in one colour


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#1 resle2   Members   -  Reputation: 102

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Posted 08 April 2013 - 12:40 AM

Sorry if this is not  the right forum, couldn't identify one to be html specific.

 

Simply put, how can I draw an image with transparency info, so that all non-transparent pixels are drawn using a given colour?

 

thanks

 

 r.



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#2 Steve_Segreto   Crossbones+   -  Reputation: 1557

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Posted 08 April 2013 - 01:03 AM

http://stackoverflow.com/questions/2359537/how-to-change-the-opacity-alpha-transparency-of-an-element-in-a-canvas-elemen



#3 resle2   Members   -  Reputation: 102

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Posted 08 April 2013 - 05:12 PM

http://stackoverflow.com/questions/2359537/how-to-change-the-opacity-alpha-transparency-of-an-element-in-a-canvas-elemen

 

thanks - but, I may be slow.. i can't see a proper solution unless it is pixel by pixel alteration, in that link. is that the case?



#4 Steve_Segreto   Crossbones+   -  Reputation: 1557

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Posted 10 April 2013 - 02:44 PM

I believe that link says its as easy as changing the canvas' context data, specifically the GlobalAlpha value.

 

e.g.

 

context.globalAlpha = 0.5f; // Half transparency

 

Am I missing something?






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