OCIO implementation is a Black Art.

[Affinity-Inspiration]

background.exr

OCIO V2 is implemented, yes. And works. But I caution users. Give up all hope all ye who pass through that portal. It’s a mysterious black art that is not for the faint hearted. Why someone would want to use something so insanely complex I can’t imagine. 
Maybe it’s just me, but I simply can’t see a wide use for it. Especially when it’s almost impossible to export what you see on the screen to a file.

There are NO step by step tutorials on its use. 

[Affinity-Inspiration]

Adding some more info.

Exported from the Export persona.

also and the settings.

background.exr

[NathanC]

Hey @Affinity-Inspiration,

The spotlight article linked below gives a good overview of what OCIO is along with it's intended uses, on the article there is also a video tutorial for setting up OCIO within Photo as well as a separate section, it is on desktop but much of what is discussed is applicable to iPad.

https://affinityspotlight.com/article/what-is-ocio-v2-and-why-does-it-matter/

As it stands there isn't a dedicated iPad tutorial for configuration but in the in app help covers the basic steps for configuration on iPad if you search for 'OCIO'. After configuring OCIO on an iPad using a 'Blender 4.0' config file opened from my iPad storage and opening your sample EXR from your initial post with a display transform active I'm left with the below result.

 

Compared to what's visible on your original screenshot, perhaps there is a problem with the external OCIO config files you're actively using, so I've attached the config files used on my iPad if you want to try setting up your config using these config files.

 

Blender 4.0.zip

[Affinity-Inspiration]

4 hours ago, NathanC said:

Hey @Affinity-Inspiration,

The spotlight article linked below gives a good overview of what OCIO is along with it's intended uses, on the article there is also a video tutorial for setting up OCIO within Photo as well as a separate section, it is on desktop but much of what is discussed is applicable to iPad.

https://affinityspotlight.com/article/what-is-ocio-v2-and-why-does-it-matter/

As it stands there isn't a dedicated iPad tutorial for configuration but in the in app help covers the basic steps for configuration on iPad if you search for 'OCIO'. After configuring OCIO on an iPad using a 'Blender 4.0' config file opened from my iPad storage and opening your sample EXR from your initial post with a display transform active I'm left with the below result.

 

Compared to what's visible on your original screenshot, perhaps there is a problem with the external OCIO config files you're actively using, so I've attached the config files used on my iPad if you want to try setting up your config using these config files.

 

Blender 4.0.zip 3.75 MB · 3 downloads

Thanks, yes. I’m making progress on all this. The config files aren’t a problem. Trying to figure it all out is 🙂

thanks

[DM1]

@NathanC hi Nathan, I’m finding the OCIO adjustment operation very flaky. The slightest movement causes the the adjustment window to disappear. The drop down menu is very difficult to scroll and is barely visible on screen. Makes it difficult to search quickly for an output. Same behaviour on latest beta version.
iPad Air m1.

 

[DM1]

@NathanC When I use the Blender 4 file you provided the EXR file from original post looks nothing like your file?

 

[Affinity-Inspiration]

I must say this is interesting. I'm discovering what ICC works best on my HP monitor. Discovering "What It All Means"... Turns out that if I want to use OCIO to any effect, I need to set one of these listed in the config file for: JR Blender 4.0 OCIO adapted for Affinity Photo 2, -> config.ocio

...

active_displays: [sRGB, Display P3, Rec.1886, Rec.2020]

For my Display Profile. This is what I have. Now I am using the HP as the main display, and the S22C350 (Samsung) as the secondary.

But they aren't listed in the OCIO config.

Interestingly, the Display P3 is the default Apple profile. And both displays work fine with that in place. And also sRGB.

So for now I'm using Display P3 on both. I'm hoping to buy a 5K LG monitor next year. Lots of bucks though. Then I can get some pretty pictures!

So anyway. At least now I know I can use Display P3 or sRGB as the base monitor profile, and use either of those in the OCIO.

Interestingly, the iPad version works the same.

I'm using the same config.ocio on both the Mac and the iPad. Works in both places. The iPad Mini is

• Liquid Retina display.
• 8.3-inch (diagonal) LED-backlit Multi-Touch display with IPS technology.
• 2266-by-1488 resolution at 326 pixels per inch (ppi)
• Wide color display (P3)
• True Tone display.

 

The Mac display profiles. Set to P3.

 

Continuing right along. Some interesting links.

A really interesting color-gamut guide is here: https://www.androidauthority.com/color-gamuts-guide-3035782/

Manual Editing of ocio config files: https://community.acescentral.com/t/manual-editing-of-config-ocio/3524/29

Filmlight things to throw light... on things: https://www.filmlight.ltd.uk/support/customer-login/colourspaces/colourspaces.php

A config generator discussion on GitHub: https://github.com/AcademySoftwareFoundation/OpenColorIO-Config-ACES/pull/11

The Word from OCIO...: https://opencolorio.readthedocs.io/en/latest/guides/authoring/rules.html

 

Now to see If I can put all or any of this to use.

Here's a short video of stepping through the options using the config mentioned at the start.

 

 

 

 

 

 

 

 

 

 

[NathanC]

On 11/24/2023 at 11:01 PM, DM1 said:

@NathanC hi Nathan, I’m finding the OCIO adjustment operation very flaky. The slightest movement causes the the adjustment window to disappear. The drop down menu is very difficult to scroll and is barely visible on screen. Makes it difficult to search quickly for an output. Same behaviour on latest beta version.
iPad Air m1.

I've now replied in your separate bug report thread regarding these issues. 🙂

On 11/25/2023 at 12:07 AM, DM1 said:

@NathanC When I use the Blender 4 file you provided the EXR file from original post looks nothing like your file?

Hmm.. I can't get it to look like your image preview with my provided config files using the original EXR image, have you unzipped the file in the iPad's local storage (I've just used the root directory of 'On my iPad') and linked Photo 2 to the entire folder on local storage? In my example I also had all the OCIO specific settings turned on under the App settings > Colour. It may also be worth trying a different .EXR file for comparison.