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Remove Background refused a grayscale image colorized with a process color by looking at the pixels the image shows. With a color mask whose masked pixels are not gray, as an opened file can hold, the check let the image through, and the gray pixels it cleared took an alpha channel under the process color. The check now reads the image's own pixels, which are the ones cleared. docs/mcp.md and the Color Mask line in docs/target-app-parity.md now say that a mask that hides no pixels leaves a grayscale image free to take a process color.