I displayed an image and it appears as one solid color. I want to inspect the values of the matte channel within my image. Also verify that you have plenty of temporary disk space. Finally, for PostScript , verify that the document contains valid PostScript statements. If you have a colormapped X server , the number of unique colors in an image must first be reduced to match the requirements of your server before it can be displayed.
Display tries to make the color reduced image closely resemble the original.
However, there are some options that may improve the appearance. You can use a private colormap. By default, your image must share colors with existing applications on your X server . The colors in your image may be very different than the shared colors and the results may be visually unsatisfactory. The disadvantage is the annoying colormap loading and unloading as you move your pointer in and out of the image window.