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FFT making transparent images

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  #1  
Old 09-11-2011, 06:28 PM
Habanero Habanero is offline
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FFT making transparent images

Hi everyone! Photo restoration is a hobby of mine, so I'm happy I found this place. I've been restoring some old photos of a family friend and thought to try the FFT filter on the harsh texture of the paper. Come to find out FFT only works on patterned texture, not frog skin texture. It's kind of charming anyway, so I suppose I'll leave it.

Anyhoo, I decided to just play around with the filter with some images I found in tutorials. When I run the IFFT at the end of my dotting process I get images that are at about 50% opacity, maybe less. I'm scratching my head on this one. I make sure there is only one layer - the one I'm trying to edit. The image is in RGB mode, and everything seems to be going "as intended" until I run IFFT. I've tried on two different images and still got the same result.

Does this sound like a PEBKAC error or is there a known issue of this sort with a fix?

(PEBKAC meaning problem exists between keyboard and chair, hehe)

Thanks for any insight someone might have!

-Habs
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Old 09-13-2011, 08:26 AM
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Tony W Tony W is offline
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Re: FFT making transparent images

Hi Habs welcome to RetouchPro. Have you followed This Tutorial ?
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Old 09-13-2011, 09:45 AM
Habanero Habanero is offline
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Re: FFT making transparent images

Hi Tony, thanks for getting back to me. Yes, that tutorial is actually how I found this site. I even tried the method on the textured half of the image, cropped so that the cleaned half wouldn't throw it off. Here's a screenshot of the result.

http://i405.photobucket.com/albums/p...ransparent.jpg
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Old 09-13-2011, 12:06 PM
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Tony W Tony W is offline
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Re: FFT making transparent images

I think the problem is likely to be that you are applying to a layer. The image needs to be flattened to be a "Background" image - it is this that you perform FFT.

So if you duplicate your image first and apply flatten to the duplicate, then use your FFT filter. Copy the filtered version and paste it into the original as a new layer set to luminosity.
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