Hi jo,
thank you for your support. I would say that your advice helped a lot as
you can check at the image below.
https://dl.dropboxusercontent.com/u/9454436/sony_noise/raw_color_blend.jpg
Although still not perfect, I think pretty acceptable for such high ISO and
finally comparable to the Lt I would say. It can be denoised even more
using the second instance of profiled denoising with non-local means and
blend with lightness, but only at the expense of loosing the details more
quickly. Therefore I prefer to not push the limits that way and leave it as
it is.
Few findings I observed:
1) it is still necessary to remove the bright red dots using the demosaic
and hot pixels tuning; the profilled denoise is not capable to get rid of
them itself
2) when leaving the profilled denoise at its default strength while using
the color blend and wavelets, I get a lot of the green dots as Baptiste
reports; they can be removed only by pushing the strength almost to its
limit
If I could contribute somehow to your testing, please let me know.
suni
2013/5/27 johannes hanika <[email protected]>
> 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
>>
>>
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