- Posts: 21
- Joined: Wed Oct 02, 2013 12:19 pm
Hello,
I'm trying to get comments/feedback on the following problem I have -
My setup is:
-PC w/ Windows 8 Pro, 32Gb RAM, i7-3770K, GeForce GTX580 3Gb
-Dell U2711 widegamut monitor
-Xrite I1 Display Pro Colorimeter
-ArgyllCMS 1.6.3
-DispCalGui 1.7.5.7
-Resolve Lite 10.1.4
Goal:
Achieve a WYSIWYG representation in Rec709 in the Viewer from the GUI of Resolve.
I KNOW that normally you should grade on a broadcast monitor feeded from an SDI/HDMI/whatever, but until i'll get there (...) I want to have a reference as close as it can be possible in the GUI. A sort of "poor's man ref monitor".
From my understanding this is technically possible because a few versions ago Resolve implemented a 3D Color Viewer Lookup Table specifically designed to address the problem of calibrating the viewer (page 89 in manual).
Also my monitor can encompass the full Rec709 space.
From parsing the net I see that the most used setups are LightSpace or Calman with a probe. Unfortunately and to my disappointment none of these two have a workflow for my goal. They both seem to concentrate only on the output monitor and dont care about the gui viewer.
Also I didn't find a step by step guide to accomplish this which amazed me because it's quite an important feature.
So I tried to put together a workflow:
1. First I understand I have to calibrate the monitor to Rec709 standards. Now, this standards seem to vary in the tons of materials I read on the internet.
http://en.wikipedia.org/wiki/Rec._709
http://www.negativespaces.com/blog/2013 ... gamma.html
http://www.poynton.com/notes/PU-PR-IS/P ... -PR-IS.pdf
White point is clear, everbody agrees.
The luminance value most commonly used was 100cd/m2, with values from 80 to 120 being mentioned.
Black level I think the lowest is the best (?).
I choosed gammma 2.2 as being the most used, but I have seen values between 2.2 and 2.6 mentioned. Also I've seen in the DispcalGui also mentioned under tone curves Rec. 709 and Rec. 1886. Maybe somebody can shed some light about these two.
So I did a factory reset on my monitor, choosed custom color as preset mode and went on with the calibration.
I choosed the following in dispcalgui:
White Point: D6500
White Level (Luminance): 100 cd/m2
Black Level: As measured
Tone Curve: Gamma 2.2
profile type: curves + matrix
testchart file: very large testchart for LUT profiles, optimized for gamma 2.2 with rec709 primaries (D65).
After 45 min I ended up with an icc profile which i set to be automatically loaded at startup.
2. Creating the 3D Lut.
Go to DispcalGui -> Tools -> Create 3D Lut
Source profile: Rec709 Gamma 2.2
Target profile: the profile we just created
Apply calibration (vcgt): UNCHECKED - we dont want the calibration to be applied twice.
Rendering intent: Relative colorimetric as widegamut is bigger then rec709
3D Lut file format: IRIDAS cube
3D Lut size: 32 x 32 x 32 (?)
Does anybody have any suggestions? Is it something I'm doing wrong ?
I'm trying to get comments/feedback on the following problem I have -
My setup is:
-PC w/ Windows 8 Pro, 32Gb RAM, i7-3770K, GeForce GTX580 3Gb
-Dell U2711 widegamut monitor
-Xrite I1 Display Pro Colorimeter
-ArgyllCMS 1.6.3
-DispCalGui 1.7.5.7
-Resolve Lite 10.1.4
Goal:
Achieve a WYSIWYG representation in Rec709 in the Viewer from the GUI of Resolve.
I KNOW that normally you should grade on a broadcast monitor feeded from an SDI/HDMI/whatever, but until i'll get there (...) I want to have a reference as close as it can be possible in the GUI. A sort of "poor's man ref monitor".
From my understanding this is technically possible because a few versions ago Resolve implemented a 3D Color Viewer Lookup Table specifically designed to address the problem of calibrating the viewer (page 89 in manual).
Also my monitor can encompass the full Rec709 space.
From parsing the net I see that the most used setups are LightSpace or Calman with a probe. Unfortunately and to my disappointment none of these two have a workflow for my goal. They both seem to concentrate only on the output monitor and dont care about the gui viewer.
Also I didn't find a step by step guide to accomplish this which amazed me because it's quite an important feature.
So I tried to put together a workflow:
1. First I understand I have to calibrate the monitor to Rec709 standards. Now, this standards seem to vary in the tons of materials I read on the internet.
http://en.wikipedia.org/wiki/Rec._709
http://www.negativespaces.com/blog/2013 ... gamma.html
http://www.poynton.com/notes/PU-PR-IS/P ... -PR-IS.pdf
White point is clear, everbody agrees.
The luminance value most commonly used was 100cd/m2, with values from 80 to 120 being mentioned.
Black level I think the lowest is the best (?).
I choosed gammma 2.2 as being the most used, but I have seen values between 2.2 and 2.6 mentioned. Also I've seen in the DispcalGui also mentioned under tone curves Rec. 709 and Rec. 1886. Maybe somebody can shed some light about these two.
So I did a factory reset on my monitor, choosed custom color as preset mode and went on with the calibration.
I choosed the following in dispcalgui:
White Point: D6500
White Level (Luminance): 100 cd/m2
Black Level: As measured
Tone Curve: Gamma 2.2
profile type: curves + matrix
testchart file: very large testchart for LUT profiles, optimized for gamma 2.2 with rec709 primaries (D65).
After 45 min I ended up with an icc profile which i set to be automatically loaded at startup.
2. Creating the 3D Lut.
Go to DispcalGui -> Tools -> Create 3D Lut
Source profile: Rec709 Gamma 2.2
Target profile: the profile we just created
Apply calibration (vcgt): UNCHECKED - we dont want the calibration to be applied twice.
Rendering intent: Relative colorimetric as widegamut is bigger then rec709
3D Lut file format: IRIDAS cube
3D Lut size: 32 x 32 x 32 (?)
Does anybody have any suggestions? Is it something I'm doing wrong ?