Denoise?

[Moreach]

I have a photo with a lot of noise, mostly white, and I've tried "denoise" some of the blurs and everything "smooth" in GMIC, mostly to little or no result or heavy blurring. I seem to be stuck with years of hand-painting them in. Surely I am overlooking something?

[Ofnuts]

Perhaps post the picture (or a relevant full-size extract)?

[Moreach]

(11-07-2022, 08:05 AM)Ofnuts Wrote: Perhaps post the picture (or a relevant full-size extract)?

Sure. Thing is it's already been upscaled from a "wallet size" and put through FFT although when I enlarged it I didn't realize it needed descreening. I don't remember where I got it. "Bubba" was a bit camera-shy. The 2nd photo is before FFT.
https://imgur.com/a/hL2BJJa

I love his "honk if anything falls off" shirt. Quintessential Bubba, trucker and drag racer.

[denzjos]

A poor quality photo but what I tried to remove the white noise :
- copy the layer
- on the new layer : Filters / Enhance / Symetric Nearest Neighbour (slider values 22 and 2)
- Filters / Blur / Gaussian Blur (values 5)
- add some saturation

   

[Moreach]

Yeah it's a lousy photo, but we have so few!

This is pretty good, thanks! Despite being a true "Bubba" he was a sweet guy in many ways. Your all-American "Knight of the Road". We miss him..
.
I saved your method, one never knows what's next and I might need it! Thanks again - Vielen Dank, Muchas gracias! <3

[Moreach]

I decided to try the same process on the original scan - before I'd messed w/ it, but discovered my GIMP 2.8 doesn't have the same filters. Should I install 2.10 instead?

[denzjos]

Descreen is a script, see : https://www.gimp-forum.net/Thread-Descreen

[Moreach]

(11-08-2022, 09:57 AM)denzjos Wrote: Descreen is a script, see : https://www.gimp-forum.net/Thread-Descreen

Oh, I descreened Ok, no prob now that FFT is installed. I meant I tried what you reported as doing to restore that lousy photograph of mine, but did not find the steps you'd reported using. Were you using GMIC? Am I looking in the wrong place for those filters? 
You'd written "From denzjos

A poor quality photo but what I tried to remove the white noise :
- copy the layer
- on the new layer : Filters / Enhance / Symetric Nearest Neighbour (slider values 22 and 2)
- Filters / Blur / Gaussian Blur (values 5)
- add some saturation"

I'd posted on Imgur a version of that photo I'd already messed with a lot and wanted to try your process on the original scan this time. Sometimes less is better! I may have accidentally increased the noise.

I'll upload that first version.   https://imgur.com/a/zCrraCN   nope - even more lousy plus a big brown dot. Probably a flyspeck...

[denzjos]

On your post I see an error on the fourier plugin and you use gimp 2.8. I've used gimp 2.10.32 and the photo on my post is reasonable nice because i'ts smaller than the original. I've tried several Gmic-Qt plugins but I found not one to do the job, so I haven't use it on this image. The image with the original dimensions, jpeg quality 94% : 
   

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You can try this : https://vanceai.com/old-photo-restoration/
   

[rich2005]

@Moreach

The de-screen script + FFT will not work very well with that image. FFT is for a coherent noise, the image posted is more random noise + jpeg artifacts.

Using Gimp 2.10 goes back to your other post and

Quote:BTW, the Mint forum has given up on me, I want to update my OS but which should I DL and try to install? Any ideas?

You should probably update to the latest Mint 21, but not the Debian edition. That gets you Gimp 2.10.30, the latest gimp_gmic_qt plugin works but there are some 'wrinkles'. It probably also means that all your files will go, so always make a backup of personal files to an external drive.

If you want to keep LMDE2 (betsy), I can point you to a Gimp 2.10 Appimage (portable application) that works, that comes with its own old version of gimp_gmic_qt but probably better than the Gimp 2.8 version. You still keep your Gimp 2.8 as well. If you want to go that route, I can demo all the 'tweaks' in a video using LMDE2