HP Scanjet 7450c HP Scanjet 7400C Series Scanner Mac - (English) User Manual - Page 36
Changing resolution, Changing contrast, Tools
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36 Scanning from HP PrecisionScan Pro Changing resolution Resolution determines the amount of data in a scanned image. The scanning software chooses the optimal resolution based on the output type. This resolution generally does not need to change. If you do change the resolution, choose one no higher than the capabilities of the monitor or printer and one appropriate for the type of scanned image. For example, to print on a 600 dpi printer, choose 600 for black-and-white bitmap images, but choose only 200 for color or grayscale images. These resolutions produce optimal quality while keeping file sizes small. Selecting higher resolutions for color images increases file size while not increasing quality. If you double the resolution, the file size quadruples. Large file sizes can prevent you from doing certain tasks, such as e-mailing, or can take up too much space on your computer. For help choosing a resolution based on the type of original item and destination, see "Tips for best image quality" on page 59. To change resolution 1 On the Tools menu, click Change Resolution. 2 Do one of the following: q Select a value from the list. q Type a value between 12 and 999,999 in the field and press ENTER. The resolution changes as soon as you select a value. To reset resolution On the Tools menu, click Change Resolution. Then, click . Back to TOC Changing contrast The contrast is controlled by the midtone, highlight, and shadow settings. See "Changing midtones" on page 40, "Changing highlights" on page 41, and "Changing shadow" on page 42.