Quick links to procedures on this page:
Converting images to the black-and-white color mode
You can convert images to the 1-bit black-and-white color mode to reduce file size, or to create artistic looks. The black-and-white color mode (also known in some programs as bitmap mode) is not the same as the grayscale color mode. In black-and-white images, each pixel must be either black or white; grayscale images can include black, white, and 254 shades of gray and are suitable for creating a black-and-white photo effect. For information about changing photos to grayscale, see “To change the color mode of an image.”
When you convert images to the black-and-white color mode, you can adjust settings — such as threshold, screen type, and intensity — and choose from seven black-and-white conversion types:
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Jarvis — applies the Jarvis algorithm to individual pixels. This form of error diffusion is suitable for photographic images.
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Stucki — applies the Stucki algorithm to individual pixels. This form of error diffusion is suitable for photographic images.
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Floyd-Steinberg — applies the Floyd-Steinberg algorithm to individual pixels. This form of error diffusion is suitable for photographic images.
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Cardinality-Distribution — creates a textured look by applying a calculation and distributing the result to each pixel.
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To convert an image to the black-and-white color mode |  |
Convert to black-and-white (1-bit).