/docs/userguide/tool_overview.rst
http://github.com/imageworks/OpenColorIO · ReStructuredText · 186 lines · 120 code · 66 blank · 0 comment · 0 complexity · 04ef64f8af79da8bd4b9c004ab3ceda2 MD5 · raw file
- ..
- SPDX-License-Identifier: CC-BY-4.0
- Copyright Contributors to the OpenColorIO Project.
- .. _userguide-tooloverview:
- Tool overview
- =============
- OCIO is comprised of many parts. At the lowest level there is the C++ API.
- This API can be used in applications and plugins
- Note that all these plugins use the same config file to define color spaces,
- roles and so on. For information on setting up configurations, see
- :ref:`configurations`
- The API
- *******
- Most users will never directly interact with the C++ API. However the API is
- used by all the supplied applications (e.g :ref:`overview-ocio2icc`) and plugins
- (e.g the :ref:`overview-nukeplugins`)
- To get started with the API, see the :ref:`developer-guide`
- .. _overview-ociocheck:
- ociocheck
- *********
- This is a command line tool which shows an overview of an OCIO config
- file, and check for obvious errors
- For example, the following shows the output of a config with a typo -
- the colorspace used for ``compositing_log`` is not incorrect::
- $ ociocheck --iconfig example.ocio
- OpenColorIO Library Version: 0.8.3
- OpenColorIO Library VersionHex: 525056
- Loading example.ocio
- ** General **
- Search Path: luts
- Working Dir: /tmp
- Default Display: sRGB
- Default View: Film
- ** Roles **
- ncf (default)
- lnf (scene_linear)
- NOT DEFINED (compositing_log)
- ** ColorSpaces **
- lnf
- lgf
- ncf
- srgb8 -- output only
- ERROR: Config failed sanitycheck. The role 'compositing_log' refers to a colorspace, 'lgff', which is not defined.
- Tests complete.
- It cannot verify the defined color transforms are "correct", only that
- the config file can be loaded by OCIO without error. Some of the
- problems it will detect are:
- * Duplicate colorspace names
- * References to undefined colorspaces
- * Required roles being undefined
- * At least one display device is defined
- As with all the OCIO command line tools, you can use the `--help` argument to
- read a description and see the other arguments accepted::
- $ ociocheck --help
- ociocheck -- validate an OpenColorIO configuration
- usage: ociocheck [options]
- --help Print help message
- --iconfig %s Input .ocio configuration file (default: $OCIO)
- --oconfig %s Output .ocio file
- .. _overview-ociobakelut:
- ociobakelut
- ***********
- A command line tool which bakes a color transform into various color
- lookup file formats ("a LUT")
- This is intended for applications that have not directly integrated
- OCIO, but can load LUT files
- If we want to create a ``lnf`` to ``srgb8`` viewer LUT for Houdini's
- MPlay::
- $ ociobakelut --inputspace scene_linear --shaperspace lg10 --outputspace srgb8 --format houdini houdini__lnf_to_lg10_to_srgb8.lut
- The ``--inputspace`` and ``-outputspace`` options specify the
- colorspace of the input image, and the displayed image.
- Since a 3D LUT can only practically operate on 0-1 (e.g a Log image),
- the ``--shaperspace`` option is specified. This uses the Houdini LUT's
- 1D "pretransform" LUT to do "lnf" to "lg10", then the 3D LUT part to
- go from "lg10" to "srgb8" (basically creating a single file containing
- a 1D linear-to-log LUT, and a 3D log-to-sRGB LUT)
- To make a log to sRGB LUT for Flame, the usage is similar, except the
- shaperspace option is omitted, as the input colorspace does not have
- values outside 0.0-1.0 (being a Log space)::
- $ ociobakelut --inputspace lg10 --outputspace srgb8 --format flame flame__lg10_to_srgb.3dl
- See the :ref:`faq-supportedlut` section for a list of formats that
- support baking
- .. TODO: For more information on baking LUT's, see :ref:`userguide-bakelut`
- .. _overview-ocio2icc:
- ocio2icc
- ********
- A command line tool to generate an ICC "proofing" profile from a color space
- transform, which can be used in applications such as Photoshop.
- A common workflow is for matte-painters to work on sRGB files in Photoshop. An
- ICC profile is used to view the work with the same film emulation transform as
- used in other departments.
- .. TODO: Link to more elaborate description
- .. _overview-ocioconvert:
- ocioconvert
- ***********
- Loads an image, applies a color transform, and saves it to a new file.
- OpenImageIO is used to open and save the file, so a wide range of formats are
- supported.
- .. TODO: Link to more elaborate description
- .. _overview-ociodisplay:
- ociodisplay
- ***********
- A basic image viewer. Uses OpenImageIO to load images, and displays them using
- OCIO and typical viewer controls (scene-linear exposure control and a
- post-display gamma control)
- May be useful to users to quickly check colorspace configuration, but
- primarily a demonstration of the OCIO API
- .. TODO: Link to more elaborate description
- .. _overview-nukeplugins:
- Nuke plugins
- ************
- A set of OCIO nodes for The Foundry's Nuke, including:
- * OCIOColorSpace, transforms between two color spaces (similar to the built-in
- "ColorSpace" node, but the colorspaces are described in the OCIO config file)
- * OCIODisplay to be used as viewer processes
- * OCIOFileTransform loads a transform from a file (e.g a 1D or 3D LUT), and
- applies it
- * OCIOCDLTransform applies CDL-compliant grades, and includes utilities to
- create/load ASC CDL files
- .. TODO - Link to more elaborate description