By default, MapInfo Pro prints your 24-bit or higher raster or grid file images in true color when the image is 24-bit and the printer supports more than 256 colors. It uses a dither method when your image converts from 24-bit to 256 colors.
Dither is large-scale patterns in images, such as color banding. Dithering may occur when the Print Raster in True Color When Possible feature is disabled in MapInfo Pro or when the printer color depth is 256 colors or less. You would change the dither method from halftone to error diffusion when you want to enhance edges in an image or make text in images more readable.
The Print Raster in True Color When Possible feature is only necessary when working with a color printer.
To print your 24-bit raster or grid file images in true color:
The Advanced Printing dialog box overrides the default print settings for individual windows. To change the default print settings, on the PRO tab, click Options, and Output Settings.