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 Transparency issue when drawing on transparent layer		  New Topic  Reply to Topic
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jiang_jiji

China
4 Posts
Posted - Mar 30 2026 :  04:27:26  Show Profile  Reply
When 
TransparencyMode := ietmReplace
is set, drawing on a transparent layer appears opaque during the process and only becomes transparent after the drawing is completed.

ps. How add a transparent layer

ImageView.LayersAdd(ielkImage, 0, 0);
ImageView.IEBitmap.Fill(0, 0);


xequte

39364 Posts
Posted - Mar 30 2026 :  17:46:12  Show Profile  Reply
Hi

1. Yes, that is limitation in the way the paint tool works (performance reasons).

2. You just need to fill the alpha channel with 0 values, so the method you are using above should be fine.

What are you seeing?

What is the size of the layer? Might need to call Allocate:

http://www.imageen.com/help/TIEBitmap.Allocate.html

Also, ensure you call update after changing the bitmap or layer properties:

ImageEnView1.Update();




Nigel
Xequte Software
www.imageen.com
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jiang_jiji

China
4 Posts
Posted - Mar 31 2026 :  04:26:50  Show Profile  Reply 
1. Yes, that is limitation in the way the paint tool works (performance reasons).

Could you please let me know if there's a way to remove or adjust this limitation?

2. You just need to fill the alpha channel with 0 values, so the method you are using above should be fine

This step is fine. The problem is that it is only opaque during MouseDown, and turns transparent again after MouseUp.
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xequte

39364 Posts
Posted - Mar 31 2026 :  19:24:05  Show Profile  Reply
Hi

We'll look at improving this in a later update, as it will require a rewrite of the painting code.

Nigel
Xequte Software
www.imageen.com
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jiang_jiji

China
4 Posts
Posted - Mar 31 2026 :  22:06:17  Show Profile  Reply
If there are plans for this, which version is it expected to be released in? This would help me better plan my product timeline.
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xequte

39364 Posts
Posted - Mar 31 2026 :  22:39:30  Show Profile  Reply
Sorry, I cannot say. There are many higher priority items.

Nigel
Xequte Software
www.imageen.com
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