TImage32.Grayscale

procedure Grayscale;


Grayscale only changes color channels. The alpha channel remains untouched.

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uses Img32, Img32.Fmt.PNG;
...
img := TImage32.Create;
img.LoadFromFile('lenna.png');
img.Grayscale;
img.SaveToFile('lenna_gray.png');
img.Free;
Before:
 After:

See Also

SetRGB