Removing halftoning

ND
Posted By
Norm Dresner
May 10, 2006
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294
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I recently had to take a scanned picture from a book and print it. Since I needed the best image I could get I wanted to eliminate the halftoning pattern from the scanned image. Since I couldn’t find anything else, I managed to at least smooth out the image with a Gaussian filter. Photoshop help offered nothing. What did I miss?

TIA
Norm
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K
Kingdom
May 10, 2006
"Norm Dresner" wrote in
news:uul8g.75199$:

I recently had to take a scanned picture from a book and print it. Since I needed the best image I could get I wanted to eliminate the halftoning pattern from the scanned image. Since I couldn’t find anything else, I managed to at least smooth out the image with a Gaussian filter. Photoshop help offered nothing. What did I miss?
TIA
Norm

Age old question with no simple answer but usually various blur methods will smooth it out trading clarity for smoothness using blur.

Try duplicating the layer and blurring the top layer then change its mode to overlay then go reduce the saturation on the bottom layer and even sharpen it.

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T
Tacit
May 11, 2006
In article <uul8g.75199$>,
"Norm Dresner" wrote:

I recently had to take a scanned picture from a book and print it. Since I needed the best image I could get I wanted to eliminate the halftoning pattern from the scanned image. Since I couldn’t find anything else, I managed to at least smooth out the image with a Gaussian filter. Photoshop help offered nothing. What did I miss?

The best way to do this is in your scanner, not Photoshop. Most scanners have an option in the scan software to remove a halftone; with many scanners, you specify this by telling the scanner software that the original is printed.

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I
Infinitech
May 12, 2006
Norm Dresner wrote:
I recently had to take a scanned picture from a book and print it. Since I needed the best image I could get I wanted to eliminate the halftoning pattern from the scanned image. Since I couldn’t find anything else, I managed to at least smooth out the image with a Gaussian filter. Photoshop help offered nothing. What did I miss?
TIA
Norm
sometimes it works just by placing the document not parrallel to the edge of the scanner but
a bit misplaced (just to get rid of the patterns used in printing, one of the pattern must be parrallel but not the document itself) Hope my way makes sense

—
Infinitech
P
Pat
May 13, 2006
Would it be out of line to suggest that you contact the copyright owner and ask for a better image?
DP
Don Pyeatt
May 13, 2006
"Norm Dresner" wrote in message
I recently had to take a scanned picture from a book and print it. Since I needed the best image I could get I wanted to eliminate the halftoning pattern from the scanned image. Since I couldn’t find anything else, I managed to at least smooth out the image with a Gaussian filter. Photoshop
help offered nothing. What did I miss?

TIA
Norm

If your goal is to reprint the image, preserve and enhance the halftoning. It’s already "the best image you can get". Scan it at the maximum optical resolution of your scanner (within limits of your memory of course), set the white point to force the paper background to white. Sharpen, color correct and re-sample it down to your desired output size. Ignore any interference patterns seen on your screen. Lightly re-sharpen and print. Try it – you will be pleased with the results.

If your goal is to display the image on a computer screen, apply the classical de-screening and blurring techniques to eliminate interference patterns.

Don
ND
Norm Dresner
May 13, 2006
"Pat" wrote in message
| Would it be out of line to suggest that you contact the copyright owner | and ask for a better image?

The image is magazine reproductions photographs of vintage railroad equipment which I’m trying to model. I don’t need a perfect image but something that allows me to see as much detail as possible and to measure sizes and layout of equipment. Quite frankly the halftoning doesn’t really destroy this much but it’s a pain to have to work around. I’m fairly satisfied with the results I got with the Gaussian Blur but wish that there was a specific plug-in to do this, much as there is software to do essentially the same thing with raw digital images.

Norm

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