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 Transparency for a layer restricted to a selection		  New Topic  Reply to Topic
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AndyColmes

USA
351 Posts
Posted - Nov 03 2011 :  08:17:13  Show Profile  Reply
I know I can adjust the transparency for a layer, but can I restrict it only to a selection if a selection exists?

fab

1310 Posts
Posted - Nov 04 2011 :  07:24:48  Show Profile  Reply
There are two ways:
1 - create a layer mask (a 8 bit gray scale bitmap which specifies the upper layer transparency, pixel by pixel)
2 - change the alpha channel of the bitmap

For example (2):
// set transparency of selected area = 50
ImageEnView1.SetSelectedAreaAlpha(50);
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AndyColmes

USA
351 Posts
Posted - Nov 07 2011 :  12:01:09  Show Profile  Reply
Thanks Fabrizio. Do you have a demo project on how this is done? I am not sure how to create a layer mask using the bitmap.
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fab

1310 Posts
Posted - Nov 08 2011 :  00:49:03  Show Profile  Reply
The demo at ImageEditing\Layers shows several layer related features (included layer mask).
About the way nr.2, just execute the code shown.
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AndyColmes

USA
351 Posts
Posted - Nov 08 2011 :  08:45:40  Show Profile  Reply
Thanks Fabrizio. I will give it a try.
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