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 ColorFillAlpha Issue		  New Topic  Reply to Topic
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jiang_jiji

China
6 Posts
Posted - Apr 29 2026 :  08:05:40  Show Profile  Reply
When using FillTool to perform a color fill, the alpha (transparency) value set via ColorFillAlpha is not respected. The filled result is always fully opaque.

ImageView.FillTool.ColorFillValue := clBlack;
ImageView.FillTool.ColorFillAlpha := 200;
ImageView.FillTool.Tolerance := 20;
ImageView.MouseInteractGeneral := [miColorFill];

Expected:


Actual:

xequte

39411 Posts
Posted - Apr 29 2026 :  18:22:28  Show Profile  Reply
Hi

In v15.0.0 and older, the alpha is not set if the image does not contain an alpha channel, so you should create one using:

ImageView1.IEBitmap.AlphaChannel; // Create alpha channel if it does not exist

This will happen automatically in v15.0.1.

Nigel
Xequte Software
www.imageen.com
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