1. Code samples
2. ColorManagement
3. Channels

Transparentize

Channels Transparentize Bitmap

Sets alpha values of pixels with a given color to transparent.

Сode Snippet

using (var bitmap = new Bitmap("ImageOnWhite.png"))
{
    bitmap.Channels.SetAlpha(1f);
    bitmap.Channels.Transparentize(new RgbColor(255, 255, 244), 0.1f);

    bitmap.Save("Transparentize.png");
}

Input

Output

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