Alpha (CineRender Surface Channel)

Note: When rendering bitmap images, make sure to use the Physical Renderer.
You can use clip mapping to mask particular areas with a Color value. Using this method, you pick the color from the selected image that you wish to become transparent. The downside is that often the areas you wish to become transparent contain several colors and the resulting alpha can leave a seam around the object. However, by setting the Delta color (see below), you can define by how much the color may deviate; this can help to reduce the seam.
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