Draw an image with custom transparency in GDI?

You just create an appropriate ColorMatrix, initialize a ImageAttributes object with it and pass that ImageAttributes object to one of the overloaded version of Graphics.DrawImage. This sample will give you 50% transparancy.

You just create an appropriate ColorMatrix, initialize a ImageAttributes object with it and pass that ImageAttributes object to one of the overloaded version of Graphics.DrawImage. This sample will give you 50% transparancy: float matrixAlpha = { new float {1, 0, 0, 0, 0}, new float {0, 1, 0, 0, 0}, new float {0, 0, 1, 0, 0}, new float {0, 0, 0, 0.5f, 0}, new float {0, 0, 0, 0, 1} }; ColorMatrix colorMatrix = new ColorMatrix( matrixAlpha ); ImageAttributes iaAlphaBlend = new ImageAttributes(); iaAlphaBlend. SetColorMatrix( colorMatrix, ColorMatrixFlag.

Default, ColorAdjustType. Bitmap ).

Thanks Danbystrom, seems to be exactly what I was looking for. – David Rutten Nov 15 '09 at 23:06.

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