what are the white balance coefficients for that image?
On Mon, May 27, 2013 at 11:57 AM, Baptiste Pierrat <
[email protected]> wrote:
> 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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>>
>>
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>
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