The Moirè effect
When scanning some original plots that were printed using offset or low resolution halftone machines, you
may sometimes find regular patterns where uniform area fills should be, like in the following example:
Original
Scanned image with Moirè
Actions
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Repeat the scan or copy at a different resolution (quality) until you get the desired effect. The Moirè
effect may appear in both high or low qualities, hence you will want to try a different quality from that
used first.
Please take into account that Moirè effect is intrinsic to any digital imaging system, and may not disappear
completely.
Flare in the image when scanning glossy originals
If the scanner is miscalibrated, or if the original plot you are trying to scan is very glossy or reflective, you can
sometimes find flare in the scanned image, as in the following example: original on the left, scanned image
on the right.
Image © www.convincingblack.com, reproduced with permission.
28 Chapter 3 Troubleshooting scan-quality issues ENWW
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