When to Noise Reduce

[hornpipe2]

My workflow generally follows the outline here:
http://docs.kde.org/development/en/extragear-graphics/digikam/photographic-editing.html

However my camera is noisy and generally needs NR when used at higher ISO settings.  My question is, where should NR fit into the workflow outlined here?  I generally do it immediately after color-adjust (WB, brightness-contrast, saturation etc.) but before inpainting and sharpen.

[Gilles Caulier-4]

With digiKam 1.0.0, i add a new wavelets NR tool, which work in YCbCr
color space, not in RGB. This want mean taht you can use it when you
want in your workflow, without to touch colors components (especially
green, as ols version of this tool do)

In general, it's better to fix noise in first before to adjust WB and colors.

If you play with RAW, do it during democaicing. there is an option in
digiKam RAW import tool.

About Camera Noise, you can found detail in web at this place :

http://www.cambridgeincolour.com/tutorials/image-noise.htm

It explain what's luminance (Y) and chroma (C) noise, and why
Luminance noise is generally more effective in camera sensor. This is
why digiKam NR tool work in YCrCb color space.

Gilles Caulier


2009/12/24 hornpipe2 <[hidden email]>:

>
> My workflow generally follows the outline here:
> http://docs.kde.org/development/en/extragear-graphics/digikam/photographic-editing.html
>
> However my camera is noisy and generally needs NR when used at higher ISO
> settings.  My question is, where should NR fit into the workflow outlined
> here?  I generally do it immediately after color-adjust (WB,
> brightness-contrast, saturation etc.) but before inpainting and sharpen.
> --
> View this message in context: http://old.nabble.com/When-to-Noise-Reduce-tp26911844p26911844.html
> Sent from the digikam-users mailing list archive at Nabble.com.
>
> _______________________________________________
> Digikam-users mailing list
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[S. Burmeister]

Am Donnerstag, 24. Dezember 2009 11:58:33 schrieb Gilles Caulier:
> With digiKam 1.0.0, i add a new wavelets NR tool, which work in YCbCr
> color space, not in RGB. This want mean taht you can use it when you
> want in your workflow, without to touch colors components (especially
> green, as ols version of this tool do)

I tried this today and it works nicely!

I noticed a lot of blue spots in the black areas and thus set luminance and
Chrominance red to 0, i.e. only used Chrominance blue, yet the blue spots did
not go away. Then I set blue to 0 and red to some value >0 and the blue spots
disappeared.

So here is my dumb question, am I wrong assuming that red should get rid of
the red spots and blue of the blue ones and that there is a bug that those two
are interchanged?

Sven
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