White level different reuslt with dipcal and spyder

[racerhh SourceForge]

Hi All,

I am moving from windows to linux with my RAW workflow. One important topic is to calibrate my displays.
So I started with my notebook internal display. Everthing looks fine. Pictures look fine – same as on windows.
The white level measured with my spyder 3 elite device at Ubunutu 15.10 and Dispcal is really close.

Min. displ. brigthness – measured in windows with spyder software: 17,7 cd/m²
Min. displ. brigthness – measured in linux with dipcal & argyll: 17.1 cd/m²

Max. displ. brigthness – measured in windows with spyder software: 168 cd/m²
Max. displ. brigthness – measured in linux with dipcal & argyll: 172 cd/m²

If I do the same test with my external ASUS VX279H LED-Monitor display connected via HDMI then the results are not as accurate.
Display settings are manuially set to the level I prefer – setting on the display are not changed from windows to linux.

White level measured in windows with spyder software: 89 cd/m²
White level measured in linux with dipcal & argyll: 118 cd/m²

I don’t know why. I verified with my camera at ISO 4000 the brigthness of the display – and I have measured the same white level. The mode option in Dispcal I have set to LCD(generic) because I have only two options (one for LCD and one for CRT).

I installed the latest releases of dispcalgui and argyllcms and I have used the one provided by the ubuntu 15.10 repository – same results.

I hope you can help me.

Thx
racer

[Florian Höch]

Hi,

White level measured in windows with spyder software: 89 cd/m²
White level measured in linux with dipcal & argyll: 118 cd/m²

I have a hunch that this is a display connected over HDMI driven with ‘video’ levels (16..235) under Windows, and ‘PC’ levels (0..255) under Linux. The latter would be a misconfiguration in Linux, likely the graphics driver.

[racerhh SourceForge]

Hi Florian,

you are absolutely right. The Nvidia driver in Linux names this setting different as the Windows driver.
If I set it in linux to limted measures 94 cd/m² which is really close.
Thx a billion 🙂

But what is the better mode for a PC-Monitor and photo workflow? You are right the Monitor is connected via HDMI. Would you recommend to set both to 0…255 or 16..235?

Thx in advance
racer

[Florian Höch]

But what is the better mode for a PC-Monitor and photo workflow?

It’s not so much a question of better, instead which is the the correct setting. Over HDMI, limited (16..235) is usually correct, otherwise you’ll clip near-black values and possibly introduce color casts and other nasty side-effects.

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