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Capter 5. Line Art Scanning > Straightening the Image

Straightening the Image

If the image you've scanned needs to be straightened, you can use the Measure tool (it looks like a ruler and is grouped with the Eyedropper tool). Draw a line across an area that should be perfectly vertical or horizontal. If there's more than one area of the image that should be straightened, you can click the middle of the measurement line and drag it around your screen to make sure it matches all the affected areas. If you need to adjust the angle of the measurement line, just drag one of its ends.

Straighten a scan while it's still in Grayscale mode. If your image is in Bitmap mode, it can be rotated only in 90-degree increments.

Whenever possible, avoid straightening scans in other software programs, such as your page-layout program. If scans are straightened in other programs, the screen redraw will take longer and printing time will increase. Also, the quality of the art will suffer, and you'll not have a true image preview.

When you scan grayscale images that have already been printed using a halftone screen, you'll often get an unwanted repetitive pattern. You might get a better result by scanning the preprinted image as line art (even though it's a grayscale photo). This method will try to capture the halftone look instead of converting the image into a grayscale file. Using the line art technique described in this chapter, you can scan grayscale images that were printed with a halftone screen of 85 lines per inch or below. If an image was printed with a halftone screen above 85 lines per inch, the image should be scanned as a normal grayscale image instead of using the line art technique.



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