1. A method for creating gamma correction data for an image processing system, comprising: generating a data pattern, the data pattern including data representing color pixels and monochrome pixels; dithering the color pixels of the data pattern; error diffusing the monochrome pixels of the data pattern, wherein the dithered color pixels and the error diffused monochrome pixels are each N-bit values, N being greater than one; generating a test pattern based on the dithered color pixels and the error diffused monochrome pixels; scanning the test pattern into scanned image data; and generating a plurality of color gamma correction curves and a monochromatic gamma correction curve from the scanned image data.