If a BMP format with 16 or more colors is specified in (Property Sheets->[Graphic]->) -GIF: for PostScript color image files, the Preview can be in color. However, displaying and scrolling become slow.
A 256-color BMP format would be suitable for previews. Note that you should select a mode with over 60,000 colors in the Windows display settings if possible. Since many colors are used in a gray scale display in parts outside of the image (cf. Q_V8), much many colors are required for both of text and images.
The size of a color BMP file is very large. The memory and hard disk must have sufficient room. For a preview using a high-resolution font such as 600 dpi, check -gfit: to on.
When you use a color printer for Windows, the above images are printed in color by a Windows driver (remove the dviout check in the Printing dialog).
When -GIF: is set to monochrome, color differences are represented in gradations. A non-color printer will express them with in differences of dot density. If you send the color image to a non-color printer, the printed result depends on the option settings of the employed Windows driver.
Most kinds of other Image data files are also handled.