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Color Bars for Monitor Calibration The grayscale chart below shows gradations of neutral gray from pure black to pure white. You should be able to discern differences in each gradation of gray, with the possible exception of the two or three darkest levels. There should be no color cast to any of the levels. The color charts below are similar to the grayscale chart at the top, showing even gradations of pure red, green and blue. You should be able to discern each gradation at the bright end. Ideally, you should also be able to discern each at the dark end, but the darkest several levels of any one color may blend together.