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Chapter 8. Understanding Colors and Chan... > Understanding the Bitmap Color Mode

Understanding the Bitmap Color Mode

Bitmap images consist of two colors: black and white. Bitmap images are sometimes referred to as 1-bit images. Think of a bitmap as a light switch with two positions, on and off. Each pixel in a bitmap image is either on or off, black or white. Because they are only 1-bit, the file size of a bitmap image is typically very small. Bitmap image have limited use, but are employed for black and white ink drawings, line art, sketches, and for creating halftone screens.

Convert an Image to Bitmap

Open an image.

Click the Image menu, point to Mode, and then click Bitmap.

IMPORTANT Before converting an image into a bitmap, it must first be in the grayscale color mode.

Enter a value for Output Resolution.

Click the Method list arrow, and then select from the available options:

  • 50% Threshold

  • Pattern Dither

  • Diffusion Dither

  • Halftone Screen

  • Custom Pattern

Click OK.


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