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Using the FFT filter to remove photgraphic paper texture

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  #31  
Old 08-18-2005, 01:55 AM
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Flora Flora is offline
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Quote:
Originally Posted by deadants
I'm using a mac as well and have googled all over looking for a plugin. So far no luck.

I have borrowed my brothers PC laptop and installed the filters, I tried the FFT RGB and imeadiatly did the IFFT RGB but the image came out transparent. Any suggestions?
Hi deadants,

what I think happened is that you run FFT on a Layer instead of a flattend image ...
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  #32  
Old 08-18-2005, 02:02 AM
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No I definatly had only one Layer. I even did step 1, duplicate the image. It's a strage one
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  #33  
Old 08-18-2005, 07:09 AM
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IFFT is real choosy and doesn't respond to anything but the most basic of images. Besides not allowing layers, you also cannot have any masking or alpha channels and your (one) layer must be "Background" (Flatten the layer <alt><L><F>).

If this doesn't help, another tip is to keep checking the IFFT from time to time instead of waiting till the end. If it's OK then just undo (<ctrl><z>) and continue fixing the FFT image.

Hope this helps,

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  #34  
Old 08-18-2005, 01:10 PM
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Hi Wils and deadants

There IS a mac version.
It’s called ImageJ

Image J is part of The Image Processing Toolkit
Available Here for Free
http://rsb.info.nih.gov/ij/download.html
ImageJ runs on Linux, Mac OS 9, Mac OS X and Windows
The Docs are here
http://rsb.info.nih.gov/ij/docs/
And the bit about FFT is here
http://rsb.info.nih.gov/ij/docs/menus/process.html#fft

It is Not a plugin but a complete program. You will need Java Installed.

Deadants
I have also had a similar problem with the image going transparent. I found it was because I went too close to the cross and the centre star. Do as Byro suggests and keep going back to check your results and saving them.


Ken
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  #35  
Old 08-18-2005, 08:00 PM
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deadants deadants is offline
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Hi Guys,
I did all of the suggested steps but it just kept going transparent, so what I did was create a new background layer and filled with black, then placed the transparent layer over it. That seems to have solved the problem.

I have tried imajeJ but It works a bit differently I found after much trial and error that you have to completely erase the centre star. I wonder if someone else with a Mac could confirm what I'm doing. You can see the attached image has on the left the original halftone image, the centre is the FFT and the right is the IFFT. I know it doesn't look to good but if I erase the outer stars and leave the centre star untouched the image turns black.
Attached Images
File Type: jpg ImageJFFT.jpg (51.8 KB, 105 views)
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  #36  
Old 08-18-2005, 08:37 PM
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Cameraken Cameraken is offline
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Hi deadants

I have ImageJ installed and I can probably help but this is probably not the correct thread to do this in.

You can start a new thread in the help section or We can continue in the thread that started this tutorial Here

http://www.retouchpro.com/forums/image-help/10660-fft-golf-balls.html


Ken
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  #37  
Old 08-18-2005, 08:44 PM
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OK Ken, New thread coming up.
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  #38  
Old 10-09-2005, 03:42 PM
june` june` is offline
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FFT Filter

I am scanning fine art pictures and have tried this tut. I am still picking up the canvas texture from the picture I have scanned. Is there any way to remedy this?

Thanks,

June
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  #39  
Old 10-09-2005, 07:40 PM
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Cameraken Cameraken is offline
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Hi June. Welcome to RetouchPro.

FFT works on a uniform pattern of texture. If you are working on canvas originals then the canvas may be stretched and then the pattern is no longer uniform

If this is the case then you could try splitting your picture into sections and using FFT on each section.

If your fine art pictures are not on canvas then post your results and we will try to help.

Ken
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  #40  
Old 10-10-2005, 09:30 AM
june` june` is offline
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help with fft

i am trying to use this filter. At step two, the entire image goes black?

Any help will be appreciated.

Thanks,
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