Hi Ferdl ~
I believe you are referring to moiré (pronounced "moray") patterns
from a scanned photo or page.
There are many tutorials online, and for the most part, they
1. Scan the image at a resolution approximately 150-200% higher than
neededfor final output.
2. Go to Filter > Noise > Median.
3. Use a radius between 1-3. The higher the quality of the source, the
lower the radius can be. You will probably find that 3 works well for
newspapers, 2 for magazines, and 1 for books.
4. Go to Image > Resize > Image Size and resample to the desired image
size and resolution using the bicubic resampling option.
5. Zoom to 100% magnification.
6. Go to Filter > Sharpen > Unsharp Mask.
7. Exact settings will depend on the image resolution, but a good
starting point is: Amount 50-100%, Radius 1-3 pixels, Threshold 1-5.
Use your eye as the final judge.
If you still have moiré patterns after applying the median filter, you
can try a slight gaussian blur.
* "Photoshop Tips & Tricks Letters"
* "How To Remove Moire Patterns From Scanned Photos
in Photoshop and Elements", by Sue Chastain
* Removing Moire (Adobe Elements Newsgroup)
* A few tips for scanning, Manual Descreen Method, by Wayne Fulton
Search terms used:
- "moire" + "photoshop elements"
- "moire patterns" + photoshop elements
Hope this helps you get sharper image,