A cool-headed display transform

Tomasz Stachowiak

Last update: Feb 23, 2023

Related tags

Cryptography tony-mc-mapface

Overview

🌈 Tony McMapface 🌈

Takes HDR Rec.709/sRGB stimulus, and maps it to LDR. It's tranquil and collected, and won't set your eyes ablaze.

About

Tony is a display transform intended for real-time applications such as games. It is intentionally boring, does not increase contrast or saturation, and stays close to the input stimulus where compression isn't necessary.

It ships as a LUT along with a bit of shader code for sampling. There's no tweakables; if you need a different look, do it before and/or after the display transform.

Please note that the shader output is linear, so if "gamma space" sRGB is desired, the sRGB OETF must be used afterwards.

There's also a basic OCIO config with sRGB output.

Disclaimer: Tony McMapface is phenomenological, and tuned to its author's visual system (with mixed success). If you need something mathematically pure, try AgX.

Ports 💖

DaVinci Resolve port by Sergey Makeev

Derivation

The generator's source code will come at a later time. Meanwhile, here's a TL;DR:

Tony McMapface takes a maximalist approach to the image formation process, and explicitly models perceptual phenomena:

Brightness-equivalent luminance of the input stimulus is compressed (accounting for the Helmholtz–Kohlrausch effect).
- The non-linearity resembles Reinhard.
Color hues are preserved during compression, except for a deliberate Bezold–Brücke shift.
To avoid posterization, selective desaturation is employed, with care to avoid the Abney effect.

As can be expected, the models underlying this process are imperfect, thus a liberal amount of eyeballing and fine tuning was applied.

Examples

HDR images from https://github.com/sobotka/Testing_Imagery

Acknowledgments

Thanks to Chris Brejon, David Briggs, Jed Smith, Troy Sobotka, and Alex Tardif for their excellent write-ups about color.

Special thanks to Troy Sobotka for eye-opening discussions, and triggering my obsessions 🙈

License

This contribution is dual licensed under EITHER OF

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

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Comments

Issues with dds format
Hello @h3r2tic and thanks for your great work!

Unfortunately I had issues trying to open the .dds LUT in Unity 2022, therefore I tried converting it, without luck.

Compressonator crashes when I load the file

Nvidia Texture Tools also fails, but is more verbose about it:

I also tried using the ktx2 file provided in #2, but both software mentioned above had issues opening that file as well. Even an up-to-date Unity ktx importer failed.

Do the above ring a bell ?

Suggestion: A raw data dump of the LUT's contents would be useful, and trivial to directly load into an HLSL Texture3D object. I assume it's a W x H x D array of 32-bit floats ?

Thanks for your time!
opened by GeorgeAdamon 10
KTX2 LUT texture

Hi! I was experimenting with https://github.com/expenses/ktx2-tools and thought I'd cook up a KTX2 version of the LUT texture as that might be more usable for some folks. I supercompressed it with Zstandard so it's a little bit smaller (354092 bytes vs 442368). I skipped out on adding a full data format descriptor section to the file as that's the part of the KTX2 spec I don't really get but most readers should be okay with that.

tony-mc-mapface.ktx2.zip

opened by expenses 1