97 lines
3.6 KiB
ReStructuredText
97 lines
3.6 KiB
ReStructuredText
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openlut - Open-source tools for practical color management.
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===========================================================
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\*\*Main development happens at
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https://git.sofusrose.com/so-rose/openlut - take a look!
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What is it?
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-----------
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openlut is, at its core, a transform-focused color management library,
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accessible from **Python 3.5+**. It's built on my own color pipeline
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needs, which includes managing Lookup Tables, Gamma/Gamut
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functions/matrices, applying color transformations, etc. .
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openlut is also a practical tool. Included soon will be a command line
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utility letting you perform complex color transformations from the
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comfort of your console. Included already is an OpenGL image viewer,
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which might grow in the future to play sequences.
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I wanted it to cover this niche simply and consistently, with batteries
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included (a library of gamma functions and color gamut matrices). Color
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management doesn't have to be so difficult!
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What About OpenColorIO? Why does this exist?
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--------------------------------------------
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OpenColorIO does amazing work - but mostly in the context of large
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applications, not-simple config files, and self-defined color space
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(with the full range of int/float bit depth specifics, etc.)
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openlut is all about images and the transforms on images. Everything
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happens in (0, 1) float space. Large emphasis is placed on managing the
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tools themselves as well - composing matrices, resizing LUTs, defining
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new gamma functions, etc. .
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In many ways, OCIO is a system stringing basic operations together. I'd
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be perfectly plausible to write an OCIO alternative with openlut in the
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backend.
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Documentation
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-------------
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Docs can be found at https://sofusrose.com/openlut. They're a work in
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progress for now (ColMap is 100% documented).
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Installation
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------------
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First: **Ensure you have dependencies!!!** The pip command will break
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without them.
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Simply use pip: ``pip3 install openlut`` (pip3 denotes that you must use
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a Python 3 version of pip). Keep in mind, there are some external
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dependencies: \* **Python 3.5**: This is Python; you need Python. \*
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**gcc**: This is needed to compile the C++ extensions. \*
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**imagemagick**: For all file IO. It's not like I was gonna write that
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myself :) .
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*If it's breaking, try running ``pip3 install -U pip setuptools``.
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Sometimes they are out of date.* *Linux: You make need to use ``sudo``
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before the command. Ignore the AssertionError when building the wheel;
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it doesn't affect anything.*
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Installing Dependencies
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-----------------------
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Not Difficult, I promise!
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On Debian/Ubuntu:
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``sudo apt-get install python3-pip gcc libmagickwand-dev``
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On Mac: ``brew install python3 gcc imagemagick`` \* You will need
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Homebrew ( copy/paste a command from http://brew.sh/ to install ) and
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XCode Command Line Tools for gcc (it should prompt you to install this).
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\* If this doesn't install pip, run
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``brew install python3; curl https://bootstrap.pypa.io/get-pip.py | python3``
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On Other: You need **python 3.5**, pip, a newer version (must support
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C++14) of **gcc**.
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Basic Library Usage
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-------------------
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To represent images, use a **ColMap** object. This handles IO to/from
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all ImageMagick supported formats (**including EXR and DPX**), as well
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as storing the image data.
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Use any child of the **Transform** class to do a color transform on a
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ColMap, using ColMap's ``apply(Transform)`` method.
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The **Transform** objects themselves have plenty of features - like LUT,
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with ``open()``, ``save()``, and ``resize()`` methods, or TransMat with
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auto-combining input matrices, or automatic spline-based interpolation
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of very small 1D LUTs - to make them helpful in and of themselves!
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Take a look at the test code under tests for examples.
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