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Display Calibration Light Illusion Forums / Display Calibration /  
 

ADL-Measurement for ColourSpace (AddOn)

 
Author Omardris
ZRO
#1 | Posted: 30 Dec 2021 16:27 
Among projector users there are always hot discussions about ON/Off contrast, ANSI contrast or in-picture contrast.
In contrast to self-luminous displays (TVs), projectors suffer from stray light that occurs in the light path and cannot be avoided completely.
Therefore, projectiondream.com determined the Average Display Luminance (ADL) of various films a few years ago and published a set of measurement images that can be used to measure stray light in the light path.
http://projectiondream.com/en/movie-brightness-adl-contrast-measurements/
So this is not calibration, but measuring projectors and of course it is not a scientific method, but more fun for real nerds.
So I created a small program that uses the remote service of ColourSpace to control the sensor and do the actual measurement. This allows to use all sensors that ColourSpace supports.
The measurement images are stored on a Raspberry Pi3 or Pi4 with PGenerator installed with Ted's Calibration Disk. Supported resolutions are 1920 x 1080 (Pi3) and 3840 x 2160 (Pi4) (16:9).
Here are some printscreens:

ADL4CS

PGenerator

Before the program is released, it should be tested even better and therefore I ask ColourSpace users who use a PGenerator and want to test the program to contact Omardris via PM.
However, I explicitly point out that ADL measurements can be made on a TV or monitor, but are useless there.
Thank you very much.
Peter

Author Omardris
ZRO
#2 | Posted: 9 Jan 2022 16:01 
In the meantime, we have arrived at version 06, which now also includes an image series for measurements with activated iris.
And there is even a quick start guide:
https://magentacloud.de/s/8wTe4ttZgAcKj9P
Peter

Author Omardris
ZRO
#3 | Posted: 29 Jan 2022 15:13 
There is very little interest in the topic of ADL measurement.
Therefore it is not worth to publish and support an own application or a ColourSpace addon for it.
Nevertheless, it was a lot of fun to deal with this topic and to develop a small tool.
Peter

Author Matthias
ZRO
Male
#4 | Posted: 31 Jan 2022 19:42 
I have no projector, but I like the idea of this add-on.

Author Omardris
ZRO
#5 | Posted: 17 Feb 2022 16:23 
Hi,
since I have so much fun tinkering with the little Raspberry and the ingenious PGenerator software, I have finished an executable version of ADL4CS despite the low demand. Yes I know - never say never.

A major reason for continuing to work on the tool was getting permission from Stacey Spears to use the layout of the ADL patterns from the "Spears & Munsil UHD HDR Benchmark Disk".

The installation and use of the tool has been greatly simplified because the ADL measurement images are now generated directly from the PGenerator rather than having to copy image files first.
However, it is still possible for dedicated users to create their own ADL measurement images and use them with the tool.
The tool is free of charge, but still copy-protected by a license file.

PGenerator

If you want to get an overview first, you should download the quick start guide.

https://magentacloud.de/s/c6eGzaQWJaKM7B4

The complete tool is available at the following link:

https://magentacloud.de/s/k3W36eY6oimQ6af

Peter

Author Omardris
ZRO
#6 | Posted: 6 Mar 2022 17:57 
Hi,
there is a new ADL4CS version 1.5.4 on the cloud, which also supports PGenerator version 1.3 Beta 1/2.
Same link.
Peter

Author Omardris
ZRO
#7 | Posted: 17 Mar 2022 12:57 
Hi,
here is an example of an ADL4CS measurement with a PGenerator Pi4 and K10A plus diffuser towards the lens of a projector JVC-NZ9 (BT709, D65, Laser low):

ADL4CS and JVC-NZ9

You can see that the JVC-NZ9 shows very good performance in ADL measurement.
Peter

Author Omardris
ZRO
#8 | Posted: 17 Aug 2022 16:11 
Hi,
even if this has nothing to do with ColourSpace anymore, because CS does not support pure luxmeters, I would like to point out that this ADL measurement is now also available for the luxmeters Mavolux 5032 and the Minolta T10A, because they have a USB interface.
ADL for Mavolux - Sample
Peter

Author Omardris
ZRO
#9 | Posted: 7 Dec 2022 17:55 
Hi,
a very fresh version 2 of ADL4CS is on the cloud and can be tested:
https://magentacloud.de/s/mLmecgaserrEzyg

Just the instructions:
https://magentacloud.de/s/LkNb77d4y9gp5Kw

Version 2 is specifically for the Raspberry P4 with the PGenerator 1.3 and higher. It includes a new mask for entering the PGenerator settings which have changed with PGen 1.3:

[imgs=ADL4CS2]ADL4CS Version 2[/imgs]

At the moment I limited the selection of the resolutions to the different frequencies at 1920x1080 and 3840x2160, because all resolutions of my JVC NZ9 were too confusing for me.

The YCbCr422 lim setting automatically forces 10Bit.
RGB full and YCbCr444 lim are always set to 8 bit first for security reasons and then can be increased to 10bit.

The new settings for the PGenerator can be tested without a license.
Since I only have the NZ9 as a true 4k device, it would be interesting to see if it works in other setups.

Of course I realize that these settings are completely unimportant and unnecessary for an ADL measurement and everything would be fine with RGB full and 1080p60, but it was just fun to honor the PGen team's much work by then using their results.
Peter

Author Omardris
ZRO
#10 | Posted: 11 Dec 2022 16:52 
Hi,
there was a bug with the 1 pixel black patch with 10bit and the delay time for reading the resolutions had to be increased, because the modern devices have up to 50 modes.
So now the ADL4CS version 2.0.1 is on the cloud at the same link.
Peter

Author Omardris
ZRO
#11 | Posted: 17 Jan 2023 17:20 
Hi,
all the best for the new year.
In the meantime version 3 of ADL4CS is ready and can be tested:
https://magentacloud.de/s/5LZpWzqWwWbFN4x
Only the manual:
https://magentacloud.de/s/p2aWDK6ZXQPA3L2

This version supports all PGenerator versions 1.1 - 1.4 and offers different setup options depending on the rPi-PGen combination.
However, PGen version 1.2 on the P3 and version 1.4 on the P4 is recommended.

Additionally a function for uploading and displaying images was added to manage own files independent from DeviceControl.

ADL4CS2

More for fun there is also access to the images of the HCFR directory that is on the PGenerator by default.

ADL4CS2

Peter

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