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from our letters department:
Color Slides to B&W Prints

Eduardo said:

" > I've seen some web sites that have scanned photos in them......mostly portrait shots....... The problem is that on some of these, I've also noticed a "wavy line" effect sort of like taking a picture of a TV screen with a camera. Does anyone know of or have any guidance on how to eliminate this effect from a picture using Photoshop. We use version 5.5 here? Just curious."

Then JC said
" Are you referring to the "artifacts" due to jpg compression?"
__ But actually, I don't think that's what Eduardo was referring to. Rastar debris or "artifacts" don't usually show up as an even effect over the whole image.
__ Without seeing a sample (hint, hint) my guess would be it's one of two problems:

A) it's a Moire (accent over the 'e')

Which is a visual effect when a screen or other regular pattern in the scanned image conflicts with the screen frequency of the scanner itself and generates the wavy pattern over the image.
__ In which case, the shot should be scanned again with scanner software that hopefully has a "Descreening" setting. If it does not...

  1. Turn the image to be scanned approx 7 degrees in the scanner.
  2. Scan the image at TWICE the normal resolution minus 10 (If 150 dpi is your target, then scan at 290 dpi)
  3. Apply a very SLIGHT Filter>Blur>Gaussian, set to a very low number like radius of .8 to 1.2
  4. Rotate the image back to level. (I use the absolute rotate and key in the degrees I think are appropriate. If that misses, I can back out and try again. Remember, the absolute allows you to set in points of a degree, giving very precision rotates.)
  5. SAVE AS, and give it another name.
  6. Now, set the resolution to the original target (Using Image Size, Constrain, Resample. Make sure interpolation is set to Bicubic.

This should do the trick. If some moire is still there, try a touch of the despeckle filter.
__ The 10% of resolution you threw away forced Photoshop to resample the image using an odd number of pixels.

B) The image is being viewed on the web where the web page crafter has set the wrong enlarge/reduce settings in the Vheight Hwidth settings, and it's improperly scaled,
__ I've seen scans on the web that looked horrible, and I captured them only to find they were scanned at some screwy resolution pixel count like 87 or 122. Scans for the Web should ALWAYS be 72 ppi. (96 ppi is acceptable because the browsers have made allowances for Microsoft's obvious inability to read a ruler correctly.)


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