In Paint Shop Pro you can reduce or remove colors in several ways. You can create black-and-white, greyscale, duotone (two-color), colorized, and sepia images. You can also create a negative image or create a positive image from a photographic negative.
Ways to reduce or remove colors:
Creating Black and White Images To create a black-and-white image, use the Threshold command. See Creating Black and White Images.
Creating Greyscale Images A greyscale image looks like a traditional black-and-white photograph. See Creating Greyscale Images.
Creating Sepia-Tone Images Sepia tones are the browns of old black-and-white photographs and newsprint. See Creating Sepia-Tone Images.
Reducing the Number of Lightness Levels Use the Posterize command to reduce the number of lightness levels in the image and create interesting effects. See Reducing the Number of Lightness Levels.
Creating Negative Images Use the Negative Image command to replace each pixel color with its opposite on the color wheel, use an Invert adjustment layer command to create an adjustment layer that has the same effect as the Negative Image command but doesn’t change the original image pixels, or use the Solarize command to produce a negative image in which you control the threshold level. See Creating Negative Images.
Changing Individual Colors You can also use the Hue Map command to change the saturation or the lightness of the image. When you adjust these values, all colors (original and shifted colors) are adjusted. For example, you can shift all greens to blues. See Changing Individual Colors.
Colorizing Images Use the Colorize command to replace all colors in a selection or an image with a single color and saturation while leaving the lightness values unchanged. You can use this command to create sepia tones (the brown seen in old photographs) and other single-color effects. See Colorizing Images.