Image Help - - pattern in paper?

shdyldy · #1 09-03-2005, 07:36 AM

I've scanned this for a friend and it's the 1st time I've seen this. Does anyone know how I can work around this pattern in the paper? This will be a tough one!
Thanks......

philbach · #2 09-03-2005, 08:10 AM

Well sometimes I just redo the background. In this case I selected Peeps and copied her to a new layer. I then added a background in the layer below her.

Kraellin · #3 09-03-2005, 08:20 AM

shdyldy,

welcome to RP!

i used paint shop pro 9's jpeg artifact remover at high 75 and it seemed to handle it fairly well. that is, if i'm reading what you're trying to get rid of correctly.

after the jpg remover you can try some smoothing filters, like median or salt and pepper or edge preserving smooth. i tried the median on the lowest setting and it was semi-ok, but required some other clean up after that. so, pick your weapon and give it a go.

but just to make sure we're talking about the same pattern, do you mean that sort of checkerboard pattern of light and dark or something else?

Craig

Cassidy · #4 09-03-2005, 08:50 AM

I found a gaussian blur of as little as 0.6 was sufficient to remove the patterning. If you are concerned about the loss of detail then rather than overlaying with a highpass filter which restores the pattern, I'd use an emboss overlay just to sharpen the edges.

shdyldy · #5 09-03-2005, 10:12 AM

Quote:

Originally Posted by Cassidy

I found a gaussian blur of as little as 0.6 was sufficient to remove the patterning. If you are concerned about the loss of detail then rather than overlaying with a highpass filter which restores the pattern, I'd use an emboss overlay just to sharpen the edges.

I had to go up to 3.4 on the higher resolution one that I have to get rid of it. I don't have Paint shop. I'm working with CS2 and not a whole lot of experience with this. I cut a part of it out so you can see it better at full size....

Cassidy · #6 09-03-2005, 10:18 AM

Not sure what you mean by full size image, I thought I had the full size image. My apologies, on your added shot, yes it takes till about 3.4-3.6 gaussian blur to remove the pattern.

shdyldy · #7 09-03-2005, 10:22 AM

Quote:

Originally Posted by Cassidy

Not sure what you mean by full size image, I thought I had the full size image

I resized it to the 800x600 100KB posting rules. It's actually 2896x3936, 1000 resolution in Photoshop. Is that my problem?

shdyldy · #8 09-03-2005, 10:24 AM

Quote:

Originally Posted by philbach

Well sometimes I just redo the background. In this case I selected Peeps and copied her to a new layer. I then added a background in the layer below her.

This looks very nice!

Cassidy · #9 09-03-2005, 10:26 AM

My apologies, on your added shot, yes it takes till about 3.4-3.6 gaussian blur to remove the pattern.

Duv · #10 09-03-2005, 10:31 AM

You should be able to reduce the pattern somewhat using the fourier transform filter. You should be able to locate it doing a google search. Also, there is a tutorial on this forum on how to use the filter.

Dave

Kraellin · #11 09-03-2005, 10:39 AM

ah, ok. i thought maybe there was more to this than we were seeing on the original post. thank you, shdyldy.

yup, this looks like a job for FFT (fast fourier transform), as duv said. that is, if you want to keep it at the original resolution. but notice in your original post how the effect was reduced because of the posting limits. you can sometimes get rid of patterns like that by simply resizing, changing resolutions or a combination of both, if you're willing to sacrifice size and resolution.

Craig

Kraellin · #12 09-03-2005, 11:00 AM

here's a couple examples of a quick use of FFT. the image 3 one used a blend mode of 'lightness' after the fft and image 4 used 'luminance' in the blend mode.

the basic steps are flatten your image if you already have layers.
run the fft filter.
paint out the 'stars' (i also paint some lines emanating out from the stars)
run the ifft filter (the counterpart to fft)
place your corrected image over the original as a new layer.
use a blend mode to get an overall effect of the two images together.

there are good tutorials, and lengthy discussions about the fft filters on these forums. you shld be able to find them by simply searching the forums using 'fft' as your keyword.

these pics i'm posting were done quickly just to show a base example of the fft. so, it appears i missed some stars or lines. a more thorough job could be done. also, dont worry about getting the pattern out of the background. the background can be completely replaced or fixed with other easier methods.

Craig

shdyldy · #13 09-03-2005, 11:09 AM

Quote:

Originally Posted by Kraellin

here's a couple examples of a quick use of FFT. the image 3 one used a blend mode of 'lightness' after the fft and image 4 used 'luminance' in the blend mode.

the basic steps are flatten your image if you already have layers.
run the fft filter.
paint out the 'stars' (i also paint some lines emanating out from the stars)
run the ifft filter (the counterpart to fft)
place your corrected image over the original as a new layer.
use a blend mode to get an overall effect of the two images together.

there are good tutorials, and lengthy discussions about the fft filters on these forums. you shld be able to find them by simply searching the forums using 'fft' as your keyword.

these pics i'm posting were done quickly just to show a base example of the fft. so, it appears i missed some stars or lines. a more thorough job could be done. also, dont worry about getting the pattern out of the background. the background can be completely replaced or fixed with other easier methods.

Craig

I found the tutorial and downloaded the filter, Thanks! However it looks like I will have to fool with it later this weekend. My husband is trying to pass a kidney stone today. Yikes!
Thanks for all your help! I read a lot on here but have never posted before. I love restoration and I have learned a lot today!

Cassidy · #14 09-03-2005, 11:17 AM

shdyldy,

Hope he's much better soon.

Kraellin · #15 09-03-2005, 11:29 AM

shdyldy,

you're welcome.

and i tried my own suggestion of changing resolution and resizing. it didnt work on this image. so, oh well. fft is probably going to be your best bet. it's not the easiest thing to work with, but with practice it can produce pretty good results. if you then follow that up with some other smoothing or slight blurring, you can probably get it to an acceptable level.

Craig