AVS Forum banner

1 - 20 of 332 Posts

·
Registered
Joined
·
127 Posts
Discussion Starter #1 (Edited)
HDR-10 calibration and test patterns set


LogoTV-avsgray-small.png Mehanik HDR10 calibration and test patterns set


HDR-10 calibration and test patterns set is designed and created by group of video enthusiasts. Main author of test patterns: mehanik99. Calibration patterns by me.
It's free and provided as is.

Feedback is welcome!

Donwload links:










List of HDR10 video test patterns

00. HDR-10 Calibration Patterns (CalMAN, ChromaPure and HCFR).

01. Black level setup

02. White&Color clipping
2.1. 10% sized windows
2.2. Extra metadata combinations (MaxCLL/FALL/MDL 0/1000/4000/10000)
03. Grayscale
3.1. Grayscale ramps
3.2. Grayscale steps
3.3. 10bit tests
04. Color reproduction
4.1. Color Ramps
4.2. Color Ramps Saturation
4.3. Linearization
4.4. Steps
4.5. Single colors
05. Chroma sharpness
5.1. Chroma sharpness&upsampling tests
5.2. SDR version
06. Aspect Ratio&Sharpness
6.1. Gray field filling
6.2. Pixel field
6.3. Gray field + pixel stripes
07. Frame Rates (including 23.976p) and judder

08. Audio Delay (central channel + 5.1) & Bitstream
8.1. SDR version
09. Test footage: sRGB (SDR) to HDR converted photos

10. ABL&Tonemaping

--


Additional test patterns:
- 4:4:4 [4K HDR10] chroma test for HTPC

- 10bit 1024 grayscale calibration steps for HDR10


--
Vladimir
 

·
Registered
Joined
·
127 Posts
Discussion Starter #2
Uploaded patterns set to Google Drive and updated download links in first post:
https://drive.google.com/drive/folders/1m4IBq0euAxamL9ePgfdFuf8_5nLcRwHA

It's basically same files as on Yandex.Disk but Google Drive may be more convenient in some cases. Be aware that pressing "download all" button takes some time and google splits files into several different zip archives with 2Gb max size (currently - 5). After downloading just unzip all (currently 5) archives into same folder.
 

·
Registered
Joined
·
458 Posts
Any suggestions, advices, ideas, complaints?
 

·
Registered
Joined
·
785 Posts
As someone who is still learning calibration, I appreciate the manual that shows what to look for with some of the patterns as well as "bad" examples. I have a collection of disks (AVS, Ted, Ryan) that have dozens of various patterns and I often don't know what I am supposed to be looking for.

Some guidance for the test footage would also be helpful. I often don't find the test footage that helpful because I don't think I can spot a small error in the red color in a bowl of cherries. ; )

If there were a few examples with guidance that would really help. For example, have an example image for near black with instructions such as "look for the detail on the black button on the jacket" etc. Otherwise, I find myself just flipping through the patterns without much of a clue. ; )

I have seen the website that goes through a few Casino Royale scenes, but I've never seen a more comprehensive post-calibration, color reproduction workflow that would take someone through the 10-15 or so patterns / test footage they should check with guidance around what to look for (both good and bad). It would be great to eventually get to this point.

Thanks much for all the effort. I hope this helps.
 

·
Registered
Joined
·
559 Posts
Any suggestions, advices, ideas, complaints?
Regarding the 10 bit test pattern: I would exchange the "good" example in the manual, because in fact it shows a bad one and is misleading. MadVR shows a fine smooth ramp with this test pattern and 8 Bit dithering. There is no need to show an "almost correct" one. :)
 

·
Registered
Joined
·
127 Posts
Discussion Starter #7
As someone who is still learning calibration, I appreciate the manual that shows what to look for with some of the patterns as well as "bad" examples. I have a collection of disks (AVS, Ted, Ryan) that have dozens of various patterns and I often don't know what I am supposed to be looking for.

Some guidance for the test footage would also be helpful. I often don't find the test footage that helpful because I don't think I can spot a small error in the red color in a bowl of cherries. ; )

If there were a few examples with guidance that would really help. For example, have an example image for near black with instructions such as "look for the detail on the black button on the jacket" etc. Otherwise, I find myself just flipping through the patterns without much of a clue. ; )

I have seen the website that goes through a few Casino Royale scenes, but I've never seen a more comprehensive post-calibration, color reproduction workflow that would take someone through the 10-15 or so patterns / test footage they should check with guidance around what to look for (both good and bad). It would be great to eventually get to this point.

Thanks much for all the effort. I hope this helps.
Makes perfect sense to me and I'd love such a workflow with real content myself!

It's easier to add a description for synthetic tests as they are designed to show specific aspects of the image in the first place. But with real content it's hard to predict what could be broken. I think that obvious rule of thumb is: image shouldn't contain visible artefacts/image flaws: banding, clipping, posterization, etc.
Current version of test footage is based on public photos (in sRGB color space) which were converted to HDR10 format. sRGB originals are in IMG directorys so you can compare two version with each other. Don't expect a perfect match as HDR10 conversion has shifted both luminance and colors and most certainly TV settings/calibration are different but both images at least should look somehow alike.

Regarding the 10 bit test pattern: I would exchange the "good" example in the manual, because in fact it shows a bad one and is misleading. MadVR shows a fine smooth ramp with this test pattern and 8 Bit dithering. There is no need to show an "almost correct" one. :)
I've already though that this screenshot is not very illustrative. I think that some overexposure could help and make it more clear of what is expected to be seen. Also will add a note about 8bit+dithering.
 

·
Registered
Joined
·
785 Posts
sRGB originals are in IMG directorys so you can compare two version with each other. Don't expect a perfect match as HDR10 conversion has shifted both luminance and colors and most certainly TV settings/calibration are different but both images at least should look somehow alike.
Thanks for your reply. One follow up question:

Based on what you wrote above, it seems as though your images are mainly designed to be compared against SDR versions to ensure they look similar. But wouldn't you want to emphasize examples of HDR that show 1) the wider color gamut of BT.2020 and 2) spectral highlights that would be less pronounced in SDR?

Seems like it would be helpful to have some examples that highlight these two key elements of HDR that make it different than SDR.
 

·
Registered
Joined
·
11 Posts
Thanks for this complete work I used to perform calibration of my new Acer VL7860 ... I successfully aligned CMS colors with the specific P3 in BT.2020 files.

Sharpness and other mire are very usefull ... together with "manual" :)

Sat.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #10
Thanks for your reply. One follow up question:

Based on what you wrote above, it seems as though your images are mainly designed to be compared against SDR versions to ensure they look similar.
Yes, it's basically SDR photos in HDR mode. They were converted to HDR10 240 nit peak brightness (and one skintone video with 135 nits peak brightness), color coverage (sRGB) didn't change.

But wouldn't you want to emphasize examples of HDR that show 1) the wider color gamut of BT.2020 and 2) spectral highlights that would be less pronounced in SDR?

Seems like it would be helpful to have some examples that highlight these two key elements of HDR that make it different than SDR.
True HDR test footage would require not only the footage itself but also HDR grading and mastering which is more of an artists work. However, I think it's an interesting topic and we'll eventually try to create a 'HDR photo'.
 

·
Registered
Joined
·
1 Posts
2 days

There are a few questions to one of your team members.
The questions about what he told me in our correspondence.
He needs to apologize.
If he can't, then I start to regret it...
 

·
Registered
Joined
·
10,066 Posts
Yes, it's basically SDR photos in HDR mode. They were converted to HDR10 240 nit peak brightness (and one skintone video with 135 nits peak brightness), color coverage (sRGB) didn't change.
I actually think that, for visual checking of the HDR calibration, "SDR photo in HDR mode" are more useful than "true HDR photos" as one can more readily do the comparison.
Would it be possible to include a complete set with 135 nits peak brightness? For projectors it's almost impossible to get 240 nits.
Thanks.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #13
I actually think that, for visual checking of the HDR calibration, "SDR photo in HDR mode" are more useful than "true HDR photos" as one can more readily do the comparison.
Would it be possible to include a complete set with 135 nits peak brightness? For projectors it's almost impossible to get 240 nits.
Thanks.
Hi Dominic,
added one more skintones video with 135 nits peak brightness version - link (original sRGB pictures are in IMG directory).
Unfortunately whole test footage set conversion to 135 nits will require too much effort so not very likely it will be done.

Also I believe that soon we'll add a video with "HDR photos" which will be based on RAW version of photos converted to PQ with peak brightness of 1000 nits.
 

·
Registered
Joined
·
10,066 Posts
Hi Dominic,
added one more skintones video with 135 nits peak brightness version - link (original sRGB pictures are in IMG directory).
Unfortunately whole test footage set conversion to 135 nits will require too much effort so not very likely it will be done.
Thank you! The pictures are all I need, as for HDR video I have different EOTF curves that allow me to adjust the overall brightness.
 

·
Registered
Joined
·
127 Posts
Discussion Starter #16

·
Registered
Joined
·
9,849 Posts
Updated HDR10 test footage!
Direct link
(or can be found in 09. Test Footage directory)
Thankyou so much for this!

I do have a question actually. If I wanted to measure colour accuracy in HDR mode I obviously can't use fully saturated colours (100% saturation) since none of us have a panel which can do full BT2020. Also, there's no point trying to measure colours at 100% luminance either because of tone-mapping.

Therefore, with Calman the recommendation is to measure 50% saturation, 50% luminance colours. The question is which (if any) of your colour sets are 50% saturation, 50% luminance? in your section you have "04. Colors\05. Single colors"

but (a) I do not know what percentage luminance each of them are. It's surprisingly difficult to find a PQ lookup table :(
 

·
Registered
Joined
·
127 Posts
Discussion Starter #18
Therefore, with Calman the recommendation is to measure 50% saturation, 50% luminance colours. The question is which (if any) of your colour sets are 50% saturation, 50% luminance? in your section you have "04. Colors\05. Single colors"
Slides from "04. Colors\05. Single colors" are not meant to be used in calibration, only for visual examination.

Currently we do have HDR10 grayscale calibration patterns - link
but there are plans to create color saturation patterns for calibration. So stay tuned!

but (a) I do not know what percentage luminance each of them are. It's surprisingly difficult to find a PQ lookup table :(
mehanik is working on such spreadsheet as we speak. It's not ready yet but here is a sneak preview of previous version - link
 

·
Registered
Joined
·
9,849 Posts
Slides from "04. Colors\05. Single colors" are not meant to be used in calibration, only for visual examination.

Currently we do have HDR10 grayscale calibration patterns - link
but there are plans to create color saturation patterns for calibration. So stay tuned!
Excellent, that's great news, thank-you! :)

mehanik is working on such spreadsheet as we speak. It's not ready yet but here is a sneak preview of previous version - link
Again, thanks that looks great :)
 

·
Registered
Joined
·
68 Posts
Thanks so much for this!

I will be using these with HCFR to calibrate my Panasonic OLED (EZ950) with HDR10. Would anyone be able to confirm if all I need are the MaxCLL 1000nit greyscale patterns? I'm not really sure what I am meant to use regarding nits, but I doubt my Panasonic would reach 4000 let alone 10K.

Thanks in advance!
 
1 - 20 of 332 Posts
Top