[OpenColorIO-Configs.git] / aces_1.0.0 / README.md

ACES 1.0.0 OpenColorIO configuration
=

Informations about ACES
-

The **ACES** project home page is here: 

- http://www.oscars.org/aces

The latest documentation on the ACES transforms and specifications can be found here:

- http://www.oscars.org/science-technology/aces/aces-documentation


Colorspaces
-

Colorspaces in this configurations are grouped into the following families: ACES, ADX, Look, Output, Input, Utility, Aliases. Descriptions for the colorspaces in the different families are provided below.

For ease of use across a broader number of applications, the family name of each colorspace is pre-prended to the colorspace name when the configuration is authored. Those prefixes will be omitted in this document, but will show up when the configuration is loaded and used.


### ACES

- Colorspaces
        - ACES2065-1
        - ACEScc
        - ACESproxy
        - ACEScg

- Description: Colorspaces and transforms representing the core ACES working and interchange color spaces.

- Technical information: Transforms generated based on the [ACES CTL Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl)

### ADX

- Colorspaces
        - ADX10
        - ADX16

- Description: Colorspaces and transforms representing the ACES ADX spaces used for film scanning and printing.

- Technical information: Transforms generated based on the [ACES CTL Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl)
        - [Alex Fry's ACES 0.7.1 OCIO config](https://github.com/imageworks/OpenColorIO-Configs/tree/master/aces_0.7.1) was also a valuable resource.

### Look

- Colorspaces
        - ACES 1.0 to 0.1 emulation
        - ACES 1.0 to 0.2 emulation
        - ACES 1.0 to 0.7 emulation

- Description: Colorspaces and transforms emulating the look of the ACES 0.1, 0.2 and 0.7 release.
        - Should be applied to data in the ACES2065-1 colorspace.
        - Should be used before an ACES Output Transform

- Technical information: Transforms generated based on the [ACES CTL Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl)

### Output

- Colorspaces
        - sRGB (D60 sim.)
        - Rec.709
        - Rec.709 (D60 sim.)
        - Rec.2020
        - DCDM (P3 gamut clip)
        - DCDM
        - P3-D60 PQ (1000 nits)
        - P3-D60 PQ (2000 nits)
        - P3-D60 PQ (4000 nits)
        - P3-D60
        - P3-DCI

- Description: Colorspaces and transforms implementing the ACES Output Transforms. These colorspaces produce code values ready for display on hardware devices calibrated to the standard used to name the colorspace.

- Technical information
        - Transforms generated based on the [ACES CTL Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl)
        - All transforms produce full-range output. Host applications should be used to apply an full-to-legal scaling needed.

### Input

- Description: Colorspaces and transforms that implement the ACES Input Transforms. These colorspaces are used to convert from camera-specific formats and encodings to ACES.
- Colorspaces: There are a variety of Input Transforms covering different cameras manufacturers, gamuts, transfer functions and camera settings. See below for specifics.

- Technical information: References and descriptions are provided for each group of Input Transforms below.
        - The colorspaces whose names include a transfer function and a gamut name are full implementations of ACES Input Transforms.
                - Ex. The ARRI 'V3 LogC (EI160) - Wide Gamut' colorspace
                - Ex. The RED 'REDlogFilm - DRAGONcolor2' colorspace
                - Ex. The Canon 'Canon-Log - DCI-P3 Daylight' colorspace
        - The colorspaces that start with "Linear - " will convert to or from a specific gamut but not apply a transfer function.
        - The colorspaces that start with "Curve - " will apply a transfer function but not convert between gamuts.

#### ARRI
- [ARRI Input Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl/idt/vendorSupplied/arri/alexa)
- Conversations with Joseph Goldstone of ARRI

#### Canon
- [Canon ACES landing page](http://usa.canon.com/cusa/professional/standard_display/aces)
- [Clog white paper](http://learn.usa.canon.com/app/pdfs/white_papers/White_Paper_Clog_optoelectronic.pdf)
- [C500 Drivers and Software](http://www.usa.canon.com/cusa/professional/products/professional_cameras/cinema_eos_cameras/eos_c500#DriversAndSoftware)
- [C300 Drivers and Software](http://www.usa.canon.com/cusa/professional/products/professional_cameras/cinema_eos_cameras/eos_c300#DriversAndSoftware)
    - Choose *OSX Mountain Lion v10.8* to download the IDTs
- [C100 Drivers and Software](http://www.usa.canon.com/cusa/professional/products/professional_cameras/cinema_eos_cameras/eos_c100#DriversAndSoftware)
    - Choose *OSX Mountain Lion v10.8* to download the IDTs

#### Panasonic
- [Vlog/V-Gamut white paper](http://pro-av.panasonic.net/en/varicam/common/pdf/VARICAM_V-Log_V-Gamut.pdf)
- [Varicam Drivers and Software](http://pro-av.panasonic.net/en/varicam/35/dl.html)

#### RED
- [Understanding REDlogFilm and REDgamma](http://www.red.com/learn/red-101/redlogfilm-redgamma)
- Conversations with Graeme Nattress of RED

#### Sony
- [Sony Input Transforms](https://github.com/ampas/aces-dev/tree/v1.0/transforms/ctl/idt/vendorSupplied/sony)

#### GoPro Experimental
- The quality and consistency of these transforms has not been verified.
- Conversations with David Newman of GoPro


### Utility

- Description: A collection of colorspaces that are used to facilitate the creation of LUTs and other basic functionality.

- Technical information:
        - The 'Log2 xx nits Shaper' and 'Dolby PQ xx nits Shaper' spaces cover the linear range centered around 18% grey. The 48 nits spaces cover -6.5 stops (0.0028125) to +6.5 stops(16.291740). The 1000 nits spaces cover -12 stops to +10 stops. The 2000 nits spaces cover -12 stops to +11 stops. The 4000 nits spaces cover -12 stops to +12 stops.
        - The LMT shaper spaces cover the linear range going from 10 stops below 18% grey (0.00017578125) to 6.5 stops above 18% grey (16.291740)
        - The colorspaces that start with "Linear - " will convert to or from a specific gamut but not apply a transfer function.
        - The colorspaces that start with "Curve - " will apply a transfer function but not convert between gamuts.

### Roles

- Description: The role colorspaces are aliases to the colorspaces used for the OCIO 'roles' functionality.

### Aliases

- Description: The alias colorspaces are named with all lower-case letters and no spaces, dashes, parentheses or other characters that would not work well in a filename. They are only references, aliases for the base colorspaces with more user-friendly names. These spaces were added to enable OCIO's token-based colorspace / filename matching.
        - These colorspaces should not generally be used by most artists.


Roles
-
The standard OCIO roles are defined. They role assignments are:

- color_picking: Output - Rec.709
- color_timing: ACEScc
- compositing_log: ACEScc
- data: Raw
- default: ACES2065-1
- matte_paint: ACEScc
- reference: Raw
- scene_linear: ACEScg
- texture_paint: Raw

Additionally, a number of colorspaces that are gaining wider adoption have been added to the config. Their names and assignment are:

- compositing_linear: ACEScg
- rendering: ACEScg


Displays and Views
-
The default config has one Display named **ACES**, which contains the following Views / colorspaces:

- sRGB D60 sim., colorspace: sRGB (D60 sim.)
- DCDM, colorspace: DCDM
- DCDM P3 gamut clip, colorspace: DCDM (P3 gamut clip)
- P3-D60, colorspace: P3-D60
- P3-D60 PQ 1000 nits, colorspace: P3-D60 PQ (1000 nits)
- P3-D60 PQ 2000 nits, colorspace: P3-D60 PQ (2000 nits)
- P3-D60 PQ 4000 nits, colorspace: P3-D60 PQ (4000 nits)
- P3-DCI, colorspace: P3-DCI
- Rec.2020, colorspace: Rec.2020
- Rec.709, colorspace: Rec.709
- Rec.709 D60 sim., colorspace: Rec.709 (D60 sim.)
- Raw, colorspace: Raw
- Log, colorspace: ACEScc

Considerations for custom config generation

- The choice of a single Display and many Views may not align well with the implementation of OCIO in an application. 
        - If you would like to generate a config that contains multiple Displays, with a small number of Views for each, review the config generation script's '--createMultipleDisplays' option.
- If a Look is added to the config, a new set of Views will be added, one for each of the Views listed above except Raw and Log, that includes the Look. The Views with Looks will be interleaved in the View list with the original Views.
        - To add a custom Look to the config, review the config generation script's '--addACESLookLUT', '--addACESLookCDL', '--addCustomLookLUT' and '--addCustomLookCDL' optoins.


LUTs
-

The default resolution is 33x33x33 for the 3D LUTs and 1024 for the 1D LUTs. 

### OCIO LUTs
The LUTs used internally by OCIO can be can be retrieved [from the repository here.](https://github.com/hpd/OpenColorIO-Configs/tree/master/aces_1.0.0/luts) 

### Baked LUTs
LUTs that can be used outside of OCIO are included in the ['baked' directory here.](https://github.com/hpd/OpenColorIO-Configs/tree/master/aces_1.0.0/baked)

- The LUTs encode the ACES Output Transform for a specific colorspace input and are generally named:
        - 'Ouput Transform name' for 'Input colorspace name'.extension
        - Ex. 'sRGB (D60 sim.) for ACEScc.icc'

The LUTs included in the 'baked' directory cover the following formats and applications:

- .3dl for Autodesk Flame
- .3dl for Autodesk Lustre
- .lut for SideFX Houdini
- .csp for Autodesk Maya
- .icc for Adobe Photoshop


Generating Configurations
-

### Python
Configurations can be generated by the following *Python* package: [aces_1.0.0/python](https://github.com/hpd/OpenColorIO-Configs/tree/master/aces_1.0.0/python)

Usage is described on the command line and in the package root [\_\_init__.py](https://github.com/hpd/OpenColorIO-Configs/blob/master/aces_1.0.0/python/aces_ocio/__init__.py) file.

Features exposed for customization by the user include: 

- The resolution of 1D and 3D LUTs
- Inclusion of custom Looks
- Two modes of creating the list of OCIO Displays and Views

### CTL Source
The configuration depends on the **'hotfixes' fork of the 1.0 ACES CTL**. The fork contains a number of minor bug fixes and small additions in the utilities folder but is otherwise the same as the master ACES 1.0 release. 

The fork is available here:

- https://github.com/ampas/aces-dev/tree/hotfixes/transforms/ctl
- Clone this repo using the following command
        - git clone --branch hotfixes https://github.com/ampas/aces-dev.git


Dependencies
-
The *Python* configuration generation package depends on the following
libraries:

- **OpenImageIO**: http://openimageio.org
        - Detailed build instructions can be found here: [OpenImageIO Build Instructions](https://sites.google.com/site/openimageio/checking-out-and-building-openimageio)
- **OpenColorIO**: http://opencolorio.org
        - Detailed build instructions can be found here: [OpenColorIO Build Instructions](http://opencolorio.org/installation.html)
- **CTL**: https://github.com/ampas/CTL


Building on Mac OSX
- 
Use the following commands to build these packages on Mac OSX

- OpenColorIO
        - brew install -vd opencolorio --with-python
- Update the homebrew repository of install scripts to make sure that OpenImageIO is included.
        - brew tap homebrew/science
- Optional Dependencies for OpenImageIO
        - brew install -vd libRaw
        - brew install -vd OpenCV
- OpenImageIO
        - brew install -vd openimageio --with-python
- CTL
        - brew install -vd CTL
- OpenColorIO, a second time. *ociolutimage* will build with *openimageio* installed.
        - brew uninstall -vd opencolorio
        - brew install -vd opencolorio --with-python

Thanks
------
The script used to generate these transforms and the transforms themselves were the product of work and conversations with a number of people. Thanks go to:

- Steve Agland
- Joe Bogacz
- Jack Binks
- Scott Dyer
- Alex Fry
- Alex Forsythe
- Joseph Goldstone
- Stephen Hill
- Jim Houston
- Thomas Mansencal
- Robert Molholm
- Nikola Milosevic
- Will McCown
- Graeme Nattress
- David Newman
- Sam Richards
- Erik Strauss
- Doug Walker
- Kevin Wheatley

Author
------
The original author of this OCIO config is:

- Haarm-Pieter Duiker