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moire pattern problem
Old 01-25-2007, 04:36 PM   #1 (permalink)
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A first for me Any suggestions how to remove it? Any help would be appreciated. It does not appear on all areas of the coat.

Thanks
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Re: moire pattern problem
Old 01-25-2007, 05:02 PM   #2 (permalink)
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Well.. I got it solved.. after working about 3 hours trying different techniques, and after I made the post. Finally used the "replace color" tool. Thought I would post the results. Thanks...
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Re: moire pattern problem
Old 01-25-2007, 05:05 PM   #3 (permalink)
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Well there are many ways to reduce or get rid of moire. It usually works better with the full size image, but I used one of the typical techniques I use to fix yours. Here is the result:





My fix is on the left, and your photo is on the right. I didn't try to fix it all the way, because the shot is too small and if I pushed it too much I'd loose other qualities. But I think you can see the difference just in the example.

How to do it?

1. Convert the image using Image | Mode | Lab Color.
2. In channels palette select the a and b channels.
3. Then select Filters | Noise | Dust and Scratches

Here is combined screen shot at this point:


Leave threshold at 0 and adjust Radius to remove the moire.

4. Convert back to RGB mode.

Cheers,
rfs
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Re: moire pattern problem
Old 01-25-2007, 05:11 PM   #4 (permalink)
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The replace color technique will work, but is harder and takes longer. The method that I indicated takes about 30 seconds.
Cheers,
Roger
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Re: moire pattern problem
Old 01-25-2007, 06:30 PM   #5 (permalink)
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But you changed the color of the coat in the process!
Also by replacing the original photo you made it more difficult to follow the development of the thread as now part of the followup commentary in subsequent posts is difficult to follow. And gives screen width problems.
Cheers,
rfs
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Re: moire pattern problem
Old 01-25-2007, 07:33 PM   #6 (permalink)
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Roger, Thanks.. I will give your method a try. YEs the color has changed. However, the color of the coat is correct in my version. (of the actual coat)

And the width of the image on my post didn't cause any problems, but since you made it 3 images wide , that seemed to.

Took me longer, about a minute.

Sorry if I caused any confusion in the thread, I figured it was best to make the post so everyone would not be confused... but now I am confused.
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Re: moire pattern problem
Old 01-25-2007, 07:59 PM   #7 (permalink)
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About the width, when I posted my original response, I posted a link to my photo and to your's side by side so that one could compare the two more easily. When you changed your original photo to which I was linking, it produced the much wider effect. But to solve that problem, I'm just going back right now and edit my original post.
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Re: moire pattern problem
Old 01-26-2007, 11:57 AM   #8 (permalink)
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Roger,

Thanks for the information about the moire removal. I tried that method and it worked somewhat. There were a couple of stubborn areas that just would not remove. One was just to the left of the lapel point (as seen in your example). I repeated the method, but they were still there.

So, in this case I think the replace color technique worked a bit better. I appreciate the info.

This is the first time I have had a moire problem. I have seen this on a couple of images of another photographer, but it was on some corrugated metal, and not very noticeable, so he just left it.
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