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Thresholding

When you scan line art in Grayscale mode, lines aren't captured as hard lines, but as a collection of pixels with different values (see Figure 12-4). But although you scanned in grayscale, you ultimately want a straight black-and-white image. The way you get there is via the Threshold command (from the Adjust submenu under the Image menu). Threshold turns gray pixels above a certain value to black, and pushes all other pixels to white.

Figure 12-4. Line art scanned as grayscale

Scanned as line art

400%

Scanned as grayscale

400%

Scanned as grayscale with sharpening and thresholding applied

400%



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