you left in all the luma noise in your lightroom comparison image. to do
that in darktable, use `color' blend mode in the profiled denoising module.
you may want to use the wavelet method, it is usually a little more
effective against color noise.
j.
On Mon, May 27, 2013 at 11:21 AM, suni <[email protected]> wrote:
> Hi all,
>
> I'm fighting the high ISO noise of my A550 camera, but I still cannot
> achieve the reasonable output. Even the new profiled denoise filter doesn't
> help much.
>
> Below is the example of the ISO12800 image. I do not take images on such
> high ISO but it makes this problem more visible for this purpose. This
> behaviour may be observed even at ISO1600 and higher. The RAW image below
> is totally unaltered RAW for comparison opened side by side in dt and in
> Lt. Only the base curve is applied at dt side because otherwise the image
> looks very ugly and not comparable to the Lt from the visual point of view.
>
> Link to unaltered RAW image:
> https://dl.dropboxusercontent.com/u/9454436/sony_noise/raw_not_altered.jpg
>
> As you can see the image looks almost the same in both tools. Just note
> the bright red dots. The Lt shows less of them especially on the right side
> of the paper Christmas tree. These red dots cannot be removed by any of the
> dt denoising filters unless the image becomes almost blurred.
>
> Now see the next image below. This shows what can be achieved in dt and in
> Lt. While only activating the luma and chroma denoise sliders in Lt
> produces the acceptable and (to me) pretty usable output where only some
> luma noise remains, with dt I cannot achieve similar output by no means.
> The most strange finding is that no one from all the denoising filters
> available in dt can remove these bright red dots unless it is pushed to not
> acceptable high strength producing the blurred image. The only strategy I
> found to be somehow working here is as follows:
> 1) turn off the sharpen filter
> 2) apply the hot pixel filter at its maximum strength
> 3) set the color smoothing of the demosaic filter to maximum
>
> These three steps do remove the bright red dots. But the image still
> suffers of the high chroma noise. The only possible way to get rid of it
> while maintaining the image sharpness at the level comparable to the Lt I
> found is the profiled denoise set to less than default strength. But as you
> can see there still remain far more chroma noise than in the Lt case.
>
> Link to altered RAW image:
> https://dl.dropboxusercontent.com/u/9454436/sony_noise/raw_altered.jpg
>
> Because I've got to that point I didn't know what to do more, I profiled
> my camera. But even though my profile seems to me to be a bit better than
> the one packed with dt, it produces no visible difference here.
>
> I would like to ask all of you experienced in fighting the high ISO noise
> for your experiences and recommendations. It would be great to get to know
> that the problem is in between the chair and the keyboard, not in the
> excellent dt tool!:-)
>
> If someone is interested, the original RAW image can be found here:
> https://dl.dropboxusercontent.com/u/9454436/sony_noise/DSC09533.ARW
>
>
> Thank you in advance for any reply!
>
> Suni
>
>
> ------------------------------------------------------------------------------
> Try New Relic Now & We'll Send You this Cool Shirt
> New Relic is the only SaaS-based application performance monitoring service
> that delivers powerful full stack analytics. Optimize and monitor your
> browser, app, & servers with just a few lines of code. Try New Relic
> and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may
> _______________________________________________
> Darktable-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/darktable-users
>
>
------------------------------------------------------------------------------
Try New Relic Now & We'll Send You this Cool Shirt
New Relic is the only SaaS-based application performance monitoring service
that delivers powerful full stack analytics. Optimize and monitor your
browser, app, & servers with just a few lines of code. Try New Relic
and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may
_______________________________________________
Darktable-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/darktable-users
