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 How to determine that an image is fully transparent?

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T O P I C    R E V I E W
papa.john Posted - Aug 19 2023 : 01:30:19
Is there some non-visual component or function that can be used to determine that an image (icon) is fully transparent?

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xequte Posted - Aug 19 2023 : 23:45:06
Hi

You can use:

  bmp := TIEBitmap.Create();
  try
    bmp.Read( 'D:\Alpha2.png' );
    if bmp.HasAlphaChannel(True) and bmp.AlphaChannel.IsAllBlack() then
      ShowMessage( 'Image is completely transparent' )
    else
      ShowMessage( 'Image NOT transparent' );
  finally
    bmp.free;
  end;


Also see:

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


Nigel
Xequte Software
www.imageen.com