Hintergrundfarbe Transparenter Bilder (z.B. PNG) ändern

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using System.Drawing;

/// <summary>
/// Ändert die Hintergrundfarbe eines Bildes (Ideal bei Transparente PNG's)
/// </summary>
/// <param name="Source">Originalbild als Image</param>
/// <param name="Back">Hintergrundfarbe</param>
/// <returns></returns>
public static Image ChangeBackColor(Image Source, Color Back)
{
	Bitmap objBitmap = new Bitmap(Source.Width, Source.Height);
	using (Graphics objGfx = System.Drawing.Graphics.FromImage(objBitmap))
	{
		objGfx.FillRectangle(new SolidBrush(Back), 0, 0, Source.Width, Source.Height);
		objGfx.DrawImage(Source, 0, 0);
	}
	return objBitmap;
}