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 How to set transparency for an image?		  New Topic  Reply to Topic
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wolf2009cn

2 Posts
Posted - Jun 03 2023 :  21:34:15  Show Profile  Reply
I am trying to set the transparency of a PNG image to 50%, but the code above doesn't work. Could you please tell me how to write the correct code? thanks.

ImageEnView1.IEBitmap.AlphaChannel.Fill(128);

xequte

38615 Posts
Posted - Jun 05 2023 :  02:10:57  Show Profile  Reply
Hi

That looks correct. Did you call ImageEnView1.Update() afterwards?

If you manipulated the bitmap directly you must call Update to show the changes in the TImageEnView.

Nigel
Xequte Software
www.imageen.com
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wolf2009cn

2 Posts
Posted - Jun 05 2023 :  10:34:13  Show Profile  Reply
I have found some methods called 'Update' in IEBitmap. I am using Delphi 7.0 with ImageEn 5.2, and I would like to set the transparency of an image. Could you please tell me how to write the code to achieve this?


ImageEnView1.IEBitmap.AlphaChannel.Fill(128);
ImageEnView1.Update();
//ImageEnView1.IO.Update;
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xequte

38615 Posts
Posted - Jun 06 2023 :  03:10:11  Show Profile  Reply
Hi

5.2.0 is quite an old version now, so I may not be recalling a difference in that version, but your code above should work.

You can also use:

ImageEnView1.Proc.AlphaFill( 128 );

http://www.imageen.com/help/TImageEnProc.AlphaFill.html

Also ensure ImageEnView1.EnableAlphaChannel is set to true:

http://www.imageen.com/help/TImageEnView.EnableAlphaChannel.html

Nigel
Xequte Software
www.imageen.com
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