Scanning photos from books, magazines and newspapers often results in an unsightly interference pattern called moire. If your scanner doesn't offer descreening, it's not too hard to remove yourself.
Difficulty: Average
Time Required: 5 minutes
Here's How:
- Scan the image at a resolution approximately 150-200% higher than what you need for final output.
- In the View menu choose Normal Viewing 1:1
- Go to Effects > Enhance Photo > Moire pattern removal.
- Increase the fine details number gradually until the pattern is gone.
- Use the proof button to preview the changes on the full image.
- In the Moire Pattern Removal dialog, zoom out to 1:3.
- If you still see patterns or splotches, increase the Remove bands setting until it is diminished. Otherwise, skip to step 9.
- Use the proof button to preview the results and adjust if neccessary. Click OK when satisfied.
- Go to Image > Resize. Activate the Actual / print size section and adjust the resolution and print size for the desired output. Any remaining pattern should be diminished when the image is resampled.
- Go to Effects > Sharpen > Unsharp Mask.
- Exact settings will depend on the image resolution, but these settings are a good starting point: Radius 1-3, Strength 50-100, Clipping 1-5. Click the proof button and use your eye as the final judge.
Tips:
- You may wish to apply a small amount of Gaussian blur before resampling if there is still any visible pattern after step 7.
