Hello,
I want to second this problem.
I have a Sony Alpha 57 and have a lot of trouble with remaining bright
color dots after denoising. My usual denoising tools for iso>800 are :
1. Chroma denoise: profiled denoising with wavelets, blend with color, then
2. Luma denoise: profiled denoising with non-local means, blend with
lightness
Here is an example with an iso 3200 sample:
original: http://minus.com/lU783RXDLcLH7
chroma denoised: http://minus.com/lBe1kgj6o5aoP
chroma and luma denoised: http://minus.com/lbqRsDO5q4E617
detail after export: http://minus.com/lCLmKR1s2vh5a
Green, red and blue larger dots remain. Also notice as chroma denoising
does not work well for green color. As suni, this problem is partially
solved by using the color smoothing option in demosaic but the image is
slightly blurred.
Thanks!
On Mon, May 27, 2013 at 11:25 AM, johannes hanika <[email protected]> wrote:
> 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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