FIVE TIPS FOR GETTING RID OF MOIR PATTERNS

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FIVE TIPS FOR GETTING RID OF MOIRÉ PATTERNS

If you scanned an image that already has been printed in one form or another, you're bound to get a moiré pattern over your image (moiré patterns are a series of dots or spots that appear on your image). These spots are your scanner picking up the halftone screen that was applied when the image was printed.

Here are five quick tips for removing moiré patterns:

  1. Go under the Filter menu, under Noise, and choose Despeckle. There are no numbers to input or sliders to adjust it either works or it doesn't, but luckily, it works about 75% of the time. However, if you run Despeckle and it doesn't work, undo it. That's because Despeckle adds a slight blur to your entire image, and if it doesn't work, there's no sense in leaving that blur applied, eh?

  2. Apply a 1-pixel or less Gaussian Blur. This will usually work if method 1 doesn't. Again, if this technique doesn't remove the moiré pattern, undo it to reduce unnecessary blurring.

  3. Go under the Filter menu, under Noise, and choose Median. Enter 1 pixel and click OK. I know I'm sounding like a broken record, but if it doesn't work, undo it. You know why.

  4. Reduce the resolution of your scan to twice the line screen it will be printed at. For example, if you scanned it at 300 dpi and you're going to print it at 100-line screen, lower the resolution of the file to 200 ppi and that'll probably do the trick. If this image is going to be used on the Web, when you lower the resolution to 72 ppi, that'll probably do it.

  5. Lastly, try rescanning the image with the image rotated slightly on the scanner bed. This is a last resort, but if all else fails, this will probably do the trick. Once the image is in Photoshop, you'll have to straighten the scan, but at least the moiré pattern will be gone.

©ISTOCKPHOTO/RON HOHENHAUS

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    Photoshop CS2 Killer Tips
    Photoshop CS2 Killer Tips
    ISBN: 0321330633
    EAN: 2147483647
    Year: 2006
    Pages: 448

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