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Making Grayscale and Bitmap mode conversions
Refer to the following instructions for converting images between Grayscale and Bitmap mode.
To convert an image to Bitmap mode:
- Do one of the following:
- If the image is in color, choose Image > Mode > Grayscale. Then choose Image > Mode > Bitmap.
- If the image is grayscale, choose Image > Mode > Bitmap.
- For Output, enter a value for the output resolution of the Bitmap-mode image, and choose a unit of measurement. By default, the current image resolution appears as both the input and the output resolutions.
- Select one of the following bitmap conversion methods:
- 50% Threshold, Pattern Dither, or Diffusion Dither to use a predefined conversion method. (See Specifying predefined Bitmap conversion methods.)
- Halftone Screen to simulate the appearance of halftone dots in the converted image. (See Specifying halftone screens for Bitmap-mode images.)
- Custom Pattern to simulate the appearance of a custom halftone screen in the converted image. (See Specifying custom halftone screens for Bitmap-mode images.)
To convert a Bitmap-mode image to grayscale:
- Choose Image > Mode > Grayscale.
- Enter a value between 1 and 16 for the size ratio.
The size ratio is the factor for scaling down the image. For example, to reduce a grayscale image by 50%, enter 2 for the size ratio. If you enter a number greater than 1, the program averages multiple pixels in the Bitmap-mode image to produce a single pixel in the grayscale image. This process lets you generate multiple shades of gray from an image scanned on a 1-bit scanner.