System and method for employing non-alpha channel image data in an alpha-channel-aware environment

摘要

An image rendered by a non-alpha-channel-aware application is employed in an alpha-channel-aware environment. The pixel data file to be written to by the non-alpha-channel-aware application is initialized by setting the alpha value for each pixel to 1. The alpha-channel-aware application then writes to the initialized pixel data file, changing some or all pixel data. The alpha value for each pixel is then decremented by 1 (modulo 256) making the changed pixels opaque and the unchanged pixels transparent.