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Chapter 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 in Photoshop 6). 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. When you're certain the line is at the proper angle, check to make sure the background color is set to white and then choose Image > Rotate Canvas > Arbitrary. Photoshop has a great feature that automatically calculates how much the image needs to be rotated, so all you have to do is click OK (Figure 5.7). Once you're done, you can choose any tool other than the measurement tool to hide the measurement line.

Figure 5.7. Photoshop automatically calculates the rotation amount needed and puts it in the dialog box.



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