Even if you are not using the bitmap mode feature for printing reasons, you can experiment with bitmap mode to create interesting effects. These are discussed in Chapter 9.

QUICK TIP

Use Photoshop's default settings for halftone screens unless your print shop specifies changes. Refer to Chapter 12 for more tips on outputting print graphics.

To convert a color file to grayscale, choose Image I Mode and select Grayscale in the flyout menu. Click OK when the dialog box automatically asks "Discard Color Information?"

To convert a grayscale image to a halftone bitmap, choose Image I Mode and select Bitmap in the flyout menu. In the dialog box, type in your requested output resolution. (Unless otherwise specified by printer or publication, I recommend an output resolution of 300 dpi or higher.) Choose Halftone in the Method option box and click OK. The Halftone dialog box automatically pops up, requesting frequency, angle, and pattern—unless otherwise specified by printer or publication, I recommend staying with the default settings, including Round for the pattern.

TRY IT TRY IT

TRY IT To convert a grayscale image to a diffusion-dither bitmap, choose Image I Mode and select Bitmap in the flyout menu. In the dialog box, type in your requested output resolution. (Unless otherwise specified by printer or publication, I recommend an output resolution of 300 dpi or higher.) Choose Diffusion Dither in the Method option box and click OK. To compare halftones and diffusion-dither bitmaps, compare the following two illustrations—the one at left is a close-up of a halftone bitmap, whereas the one on the right is a diffusion-dither bitmap.

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Photoshop CS Mastery

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