Select 256 colors of BMP or higher in -GIF: of "Property Sheets->[Graphic]".
Usually, even when the Windows display setting is in 256 colors, a 256-color image is not displayed properly in dviout. The reason is the following.
The Windows system itself is using colors for other process already, and dviout also uses a maximum of 112 colors (of 16.77 million colors) with a 16-level gray scale displaying (each level has 7 colors). Therefore, the rest of the 256-color resource is not sufficient for another process of displaying with 256-color images.
If the image data has 256 colors, select more than 65,535 colors in the Windows view setting.