Meet the GIMP!

Episode 063: More Noises in the Dark!

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Not so much progress on the noise side - I tried to reduce chroma noise with an option in UFRaw. The result is, well, see yourself in the image above (200% view).

1 - the noisy image

2 - the denoised image

3 - the denoised image with chroma noise reduction

4 - 1 and 3 combined with a mask for the edges.

I’ll explore soe more noise reduction options before I finish this image.

In the main part of this video you’ll see how to register an additional image into the already rotated and cropped  stack of layers.

The TOC:

Reducing Chroma Noise in UFRaw 03:00
Register an additional image into the layer stack 06:00
Moving the layer to a register point 06:30
Setting the center point for rotation 08:40
Cropping the layer to the image size 13:20
Checking the results 14:00
Recap 15:30
Why the Neon Filter? 16:20
When is an image finished? 18:10
Save as a new one layer image 19:40

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Tags: chroma noise, noise, register

This entry was posted on Tuesday, September 30th, 2008 at 6:00 pm and is filed under Gimp, Gimp video tutorial. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

5 Responses to “Episode 063: More Noises in the Dark!”

1. Andreas Steinel says:

   September 30, 2008 at 7:19 pm

   Hi,

   chroma noise is not a big problem. Use selective gaussian blur in YCrCb Colorspace.

   Best,
   Andreas
2. jgack says:

   October 1, 2008 at 8:03 am

   Could you be a bit more explicit?

   Does it make a difference which of the 4 YCbCr models is used for decomposition?
   And once decomposed, which channel(s) should be blurred? I might guess the answer is redness in this case, perhaps .. is that right? And what values of radius and max-delta have you had success with? Oor what would you recommend starting with?

   Or perhaps you can provide a link that gives further help?

   Thanks
3. clickblog says:

   October 1, 2008 at 11:02 am

   Come ridurre il rumore con Gimp…

   Meet the Gimp è una serie di videopodcast dedicati all’uso del programma libero Gimp.
   In questa puntata si parla di come eliminare il chroma noise da un’immagine scattata con poca luce. Il chroma noise è il rumore composto da quei color…
4. Rolf says:

   October 1, 2008 at 12:35 pm

   3900 downloads already - but 3000 of them are from one machine in Russia. No idea if DOS or a script going wild.

   The load must have been so heavy that the forum database connection broke for some time - I got a warning mail at around midnight my time.
5. The p-Code Machine » Meet The GIMP says:

   November 26, 2008 at 10:08 pm

   [...] Episode 063: More Noise in the Dark [...]