quality loss using DNG converter

Hello

I am using LR (v5.7) for my pictures treatment, unfortunately my new camera (SONY A68) is not covered by my LR version.

I've seen that Adobe suggests using DNG converter to sort this problem out so I've converted my new RAW files into DNG using it before uploading them into LR.

Nevertheless, no matter which setting is selected into DNG converter, when I open the converted DNG file into LR, there is visible quality loss on the picture (no need to zoom in).

Except being forced to migrate on LR v6 (with a whole package I don't really need), I would like to know wether there is a real solution possible with DNG converter ?

Thank you for your help

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 04, 2019

I have on occasion used the DNG converter. I have never been able to see any degree of image degradation from converting the DNG when comparing the DNG file with the original raw file. I have done this with my own images, mostly NEF files from Nikon, as well as other formats from other manufacturers. Your comparison could possibly be between the embedded JPEG preview that the camera displays (because the camera cannot display the raw data) and the actual raw data that is displayed when you are actually working on the image. How are you comparing the DNG to the original raw data?

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Re: quality loss using DNG converter

Thanks for your reply.

I’ve looked up on the Internet and, like you, no one seems to have this kind of problem. But the differences between my RAWs and the DNG are so obvious that it’s really troubling and I am doubting to convert the files properly.

I am not comparing the jpeg previews (which are really poor quality) with the original files. I am comparing the Raws shown by Windows preview with the DNG once imported in LR (with the same the zoom). Colors of the DNG are much less saturated and the the worst problem regards the picture noise which is highly visible on the DNG and almost absent in the RAWs.

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 06, 2019

kalul59420055  wrote

I am comparing the Raws shown by Windows preview with the DNG once imported in LR (with the same the zoom).

Please post a screenshot from Lightroom with the two images compared at 1:1 magnification.

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 06, 2019

I misread your post, and see now that you are comparing a jpg preview of the raw file with the unedited DNG.

The jpg preview that you see in Windows Explorer most likely has some settings from the camera applied to it – like saturation and noise reduction. Although these settings may be written to the raw file, Lightroom doesn't understand proprietary settings, and ignores them.

So you have to edit the DNG file in Lightroom to achieve the same look and quality.

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Re: quality loss using DNG converter

OK thanks for your reply. I had the screenshot you requested prepared but I am not going to post it then.

I didn’t know Windows could show the RAWs with some settings applied to it. I therefore assumed that the RAWs should look like my DNGs (and vice versa).

However I am still surprised that the noise on the DNG is so high even though I can correct this with LR.

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 06, 2019

Windows cannot display the raw file, so it displays the embedded jpg preview, which will have camera settings applied to it.

Noise is usually caused by a high ISO setting and/or underexposure.

I might be able to make some further comments on that if you post a screenshot of the DNG image at 1:1 in Develop, with the Histogram, Basic panel and Detail panel visible. If you make sure that your mouse is off the image when you take the screenshot, exposure information, including ISO, will be visible below the histogram.

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Re: quality loss using DNG converter

Sorry for my late reply. Here is an example as requested :

Capture d

Capture d

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 13, 2019

Please post a screenshot of the image at 1:1.

Noise and sharpening must be evaluated at 1:1, where one image pixel is represented by one screen pixel. Fit view (ADAPT.) will always be misleading.

The image is shot at ISO 100, and is not badly underexposed, so there should be no or very little noise.

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Re: quality loss using DNG converter

Sorry, I thought I had clicked on 1:1

Capture d

Capture d

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Re: quality loss using DNG converter

Adobe Community Professional , Apr 15, 2019

I can't see any noise in the image, as expected.

The image needs some editing, like an increase in exposure and/or whites, and some clarity. Possibly also some more sharpening and saturation.

Just to make it clear, converting a raw file to DNG doesn't touch the image part of the file.

So a raw file and a dng from the raw file will display identically.

I have routinely been converting raw files to DNG for more than 10 years, and have never had any problems whatsoever.

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Re: quality loss using DNG converter

I have the same issue.

Quite serious image quality loss and other imposed issues when opening a converted file in Photoshop Elements 6.0.

I use Sony A7r, A7s and a6000.

Camera Raw 1.0.

DNG converter is set to convert to Camera Raw 4.1 and later.

It should be quite easy to see the problem in the pics below. The last one is DNG converted.

_DSC6158.JPG_DSC6158 adobe small.png

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Re: quality loss using DNG converter

Sorry, Camera Raw 4.2.

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Re: quality loss using DNG converter

Adobe Community Professional , Jul 05, 2019

I see that the first image you posted is an actual image file, whereas the other is a screenshot.

So is this screenshot from Camera Raw, or some other application?

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Re: quality loss using DNG converter

Hi Per,

They're just output in a different format. It doesn't matter what format I use for the output image, the result is the same.

However, I just opened the raw picture from the DNG Converter in "RawTherapee", an open source raw file processing program. Interestingly, the output picture from RawTherapee comes out with no visual image quality loss! Please refer attached picture.

So, it seems to me now that my version of Camera Raw does something weird when opening the file, and that this is the issue, what do you think?

_DSC6158 rawtherapee.jpg

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Re: quality loss using DNG converter

Adobe Community Professional , Jul 06, 2019

Please provide some more details.

  1. Do the raw file and the DNG display differently in Camera Raw?
  2. Or does the difference appear when you open the files in Elements?
  3. Or are you talking about files that have been saved or exported from Elements, and then opened in another application?
  4. If that's the case, what application are you using to view the files?
  5. What operating system do you use?
  6. And what exactly do you mean by quality loss?

If you put the original raw file and the DNG on a file sharing service like Dropbox and post the link here, I can take a look at them.

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Re: quality loss using DNG converter

Hi Per,

1. I can't open the raw file in Adobe Elements.
I believe the reason I can't open the raw file in elements has to do with the raw file format from my Sony cameras coupled with an old Elements version. This is the reason I got onto DNG.

2. I can only open a DNG converted file in Elements and it will only open in Elements after Camera Raw has done it's bit,

3. The issue appears in Camera Raw (and so also in Elements).

4. Windows 8.1

5. The quality issue should be obvious in the second original picture I posted (the "DNG converted one"). Look at e.g. the area in between the two white windows. Colour and contrast is also way off. Does it not show very clearly on your end? If you can see it on your end, then uploading the files will not provide any more info I guess? Happy to do it anyway, let me know.

Here is the issue as captured in a screenshot:

Camera Raw screenshot.PNG

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