I’ve loaded a raw file in Photolab 2.1.1 having quite large dynamic range, but does not suffer from clipping using one of the DXO standard color presets.
Selected the “no correction” DXO preset -> no clipping.
Loaded the Adobe standard DCP profile for my Olympus E-M10.2 -> image shows clipping.
This seems to occurr with basically every DCP profile I’ve tried.
However, loading the same raw file and same DCP profile e.g. in Raw Therapee, I do not notice clipping.
So the issue seems not to be with the DCP profiles but with how DXO handles them. Does it maybe imply some sort of curve change?
Hello jdm,
I tried with your scenario by enabling “shadow/highlight clipping” options in Histogram palette and i see the clipping when applying DCP profile (created by Adielle and myself) . We will investigate on it to know what is happening.
I will let you know the result.
Regards,
HT
I think the shadow/highlight clipping might indicate out-of-gamut colours, as well as luminance clipping. Since PhotoLab uses Adobe RGB working space the application of the DCP profile might be pushing some of the colours beyond Adobe RGB, that’s why the clipping indicator gets active. Do you use the auto function of the “Protect saturated colors” slider in the Color rendering tool?
I haven’t noticed this phenomenon when using Adobe DCP profiles for my camera. The only difference between DxO PL2 and Lightroom when using the same camera profile and all else disabled is that the black subtraction in PL seems to be different than in Lr (increasing shadow contrast a bit). Also WB is calculated differently by the two applications, but apart from that the new DCP support works quite well for me.
Hello,
yes, I used Intensity 100 and “Protect saturated colors” was set to Auto, WB was set to “Original”. No other correction has been applied.
I’ve tried with the profiles provided by Adielle (first post), with profiles I’ve created myself, with Huelight profiles as well as with the Adobe standard dcp for my camera - each dcp shows the same: considerably more clipping than any of the dxo standard color presets. I was wondering why “protect saturated colors” did not help.
Here are two screenshots of one file opened in Lr5 and DxO PL2. In both I have disabled everything there is to disable and applied the same Adobe Standard DCP profile for my camera.
First, the screenshot of PhotoLab, with the Shadow clipping indicators ON:
As you can see, both show more or less a similar area outside of the Adobe RGB gamut. PhotoLab has crushed shadows a bit more, but the reds/pinks in the photo are not extremely dark, so my guess the Shadow clipping indicator in PL also performs the out-of-gamut function.
Interesting. What would be the solution then? DxO switching to ProPhoto?
This is a screenshot where you can see some clipping warnings even with DxO standard preset:
Just the raw file loaded, then applied DxO “no correction” preset to turn everything off and to use the camera standard color preset.
(following in next post)
Edit: funny, just looking at my screenshots again, notice that the auto-chosen “protect saturated colors” value is lower than in the first image, and at the same time has more clipping. But even manually pushing it to the max value, it still shows more clipping.
The clipping warning in your first screenshot looks like out-of-gamut warning for the deep yellow (yes, the Protect saturated colors slider didn’t manage to contain the gamut). I think having ProPhoto working space would help if you wanted to print the photo. The second screenshot indeed shows a tonal shift resulting in greater contrast and clipped shadows and highlights – part of the problem can be explained by the wrong black subtraction applied by PhotoLab (see the link in post no.7 above).
Hello Sankos,
you are right. Part of the problem can really be solved by disabling automatic black level subtraction. But only part of it unfortunately. I’ve decompiled the Adobe Std dcp using dcptool, disabled the automatic black level subtraction (i.e., setting the “DefaultBlackRender” tag from 0 (Auto) to 1 (disabled), and compiled it back to dcp. Compare the results to the previous screenshot:
Nice. I think it should be relatively easy for the DxO team to fix the black level subtraction thing. Hopefully highlight clipping will be addressed as well. I don’t see clipped highlights when applying DCP profiles in my photos because I’m not very aggressive about my ETTR, having a nearly ISO-invariant camera.
I’m working on DCP profiles for my camera and I also noticed that DxO Photo Lab 3 applies more important black substraction than other RAW converters (e.g. Lightroom) when the profile is flagged with “automatic black substraction”.
Actually, even when the profile is not flagged, it still applies some level of black substrraction, but less violent.
It looks like DxO Photo Lab has some built-in black ubstractions values and when the profile ask for black substraction the software applies both its own built-in substraction values + what the profile is asking for…
Some feedback from DxO team would be very much appreciated!
Adobe Photoshop Lightroom v.3.2 build 20200204-0604-bc5e360 (installed just a few weeks ago)
Default preset, except 'Profile’ set to an imported DCP profile
Export to sRGB
DCP profile has been generated with Lumariver Profile Designer v.1.0.6 and the ‘black substraction’ tag enabled (very same profile as DxO Photo Lab)
In addition to differences in vivid colors (some colors are way outside sRGB, so I guess this is due to how gamut compression is (or is not maybe…) handled…), there is more black crush in DxO.
If I redo the operation with ‘black substraction’ flasg disabled in Lumariver, both DxO Photo Lab and Lightroom show less black crush. BUT, DxO still show way mroe than Lightroom. Like if some black substraction was applied anyhow the ‘black suvbstraction’ tag is enabled or not the profile…
I have DxO Photo Lab v.3.2.0 build 4344 and it does not seem fixed.
See an exemple below:
DxO Photo Lab v.3.2.0 build 4344
Default preset, except ‘DxO Smart Lighting’ set to ‘off’ and ‘Color Rendering’ set to an imported DCP profile
Export to sRGB
DCP profile has been generated with Lumariver Profile Designer v.1.0.6 and the ‘black substraction’ tag enabled
