Hi all, I've used a 3D LUT on a SmallHD 2403 with an i1D3 matched to a i1Pro 3. The monitor is purposely set to its max backlight level. I generated the LUT with Fit Space to Rec 709 using a 21 point Cube.

I've attached a post-calibration color space. I know the monitor can be more accurate, just not sure which techniques and filters to use now to do that. We're not a color grading facility nor need anywhere close to perfect color but I find the pursuit enjoyable.

What techniques / tips / tricks could I employ? Thanks

Attached file: SmallHD24.bcs

Unfortunately the SmallHD OS doesn't offer any pre-calibration controls except Sharpness. I had to upload a Null LUT. You can change brightness and contrast, but it's for that specific LUT.

EricCT
You would need to post a .zip file with the pre-calibration profile, the LUT you generated, and the post calibration verification profile.
One profile on its own is not enough to define much.

But, the RGB Separation graph shows there are issues with the volumetric non-linearity of the display.
As the various User Guides explain, such poor RGB Separation means large volumetric profiles will be need for accurate calibration.

Steve

Hi Steve, see attached. Any settings I should change before I run a full 10K patch set? Thanks for your guidance as always.

Attached file: BCS.zip

Attached file: SmallHD24-5000patches-051923.zip

Ok - I can see the issue with the RGB Separation.
The verification shows poor RGB Separation as it is fixing the volumetric issues with the original profile.
But, the original profile issues mean Fit Space is not the best option - The normal Peak Chroma approach will likely be needed due to the display's poor original volumetric response, as shown by the profile.

You can see just how bad the display is by comparing the original profile to an extraction of the native colour space of the display.
(See the attached colour space extraction, and use that as the target colour space.)

Also, the Drift is horrendous.
You will need to better manage that during profiling.

And obviously, the display cannot cover Rec709, especially in blue, so there will always be gamut issues.

Steve

Attached file: Extracted Space

Thanks Steve, makes sense now why Peak Chroma only said 82% coverage. I'll re-read about the drift and give it all another shot.

Thanks for the feedback.

Hi Steve, I did a new profile with backlight close to 100 nits. Then I extracted the space and verified the monitor against itself. Attached are those two profiles. Does this show you any further insight, or just verifies that it inherently isn't a great display. I did a 25 frame drift this time; lowering the frame count is what I gathered you meant by managing the drift?

Thanks

Attached file: Archive.zip

You've provided two profiles that are basically identical...
(Actually, are identical... not basically.)
You need to save the profile with the extracted colour space in use, as the profile will then recall the target colour space when you open it...
And you need to provide the extracted colour space too.
Also, the set target Min/Max luma is very different to the profile measured values - was that intended?

Anyway...
Drift is now equally as bad as before, but in a very different way... it is now sawtooth, rather than drifting over the whole profile duration.
You probably need Pre-Roll, and Stabilisation frames.

But the rest of the profile is, if anything, worse than before.
There are huge luminance discrepancies throughout the colour volume.
And the EOTF is still appalling.
With the gamut just the same - still not able to cover Rec709.

Steve

Sorry, I actually thought I did that exact process..saved the "VerifyAgainstSelf" with the extracted space as the target.


Not intended usually after I run the profile, I click the carrot to put the values in there. I noticed it's always switching on me and I haven't figure out how to save Spaces with it set...sorry again.

Thank you for the other info.

Ah - you may have. But as you have not provided the Extacted colour space, ColourSpace can't load it when the profile is opened, so defaults to the first in the list.


Whatever values are in the Target Min/Max will be saved with the profile.
If you want them to always update the profile Min/Max, tich the Auto box, as per the User Guides.

Steve

Thanks, sorry, I have read through and have been re-reading the Guides and watching the videos, so I am trying before I reach out but apparently have to keep at it ha

No worries - just pointing out the info is - usually - in the guides.
But I know there is a lot to read and review.

Steve

I got 6200 patches in of a 21-point cube with 50 frame drift overnight before the Windows laptop went to sleep and messed it up *eyeroll*. Stabilisation of 1 second. The drift was still sawtooth with the 6200 patches that did process.

Did you use a decent Pre-Roll, and Stabilisation patches?
(And you won't forget to disable lappy sleep again...)

Steve

The Stabilisation patches were black 000. Could you expand upon the Pre-Roll? My understanding is that it's to help the display warmup, but the display was on all night so is certainly warm. Does it assist in other ways?