I made a typo in my previous email. Here is the correct version. Olivier just helped me to define more grayscale color. But when I draw an image using 2D-histogram using the "col" or colz" option, bin with zero content shows up as white (black being low count and white being high count). It looks correct with "surf/color" draw option. In addition, even in the DeepSea palette, bin with zero content still shows up as white. My guess is no color is assigned to bin with zero content. Is this a bug? Seng
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