1.1.1 Examples

The main entry point of the library is the read_clf function in the main namespace, which allows one to parse a CLF document:

import colour_clf_io

example = """<?xml version="1.0" ?>
    <ProcessList xmlns="urn:AMPAS:CLF:v3.0" id="Example Wrapper" compCLFversion="2.0">
        <LUT3D id="lut-24" name="green look" interpolation="trilinear" inBitDepth="12i" outBitDepth="16f">
            <Description>3D LUT</Description>
            <Array dim="2 2 2 3">
                0.0 0.0 0.0
                0.0 0.0 1.0
                0.0 1.0 0.0
                0.0 1.0 1.0
                1.0 0.0 0.0
                1.0 0.0 1.0
                1.0 1.0 0.0
                1.0 1.0 1.0
            </Array>
            </LUT3D>
    </ProcessList>
"""  # noqa: E501
clf_doc = colour_clf_io.read_clf(example)
print(clf_doc)

ProcessList(id='Example Wrapper', compatible_CLF_version='3.0', process_nodes=[LUT3D(id='lut-24', name='green look', in_bit_depth=<BitDepth.i12: '12i'>, out_bit_depth=<BitDepth.f16: '16f'>, description='3D LUT', array=Array(values=[0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0, 1.0], dim=(2, 2, 2, 3)), half_domain=False, raw_halfs=False, interpolation=<Interpolation3D.TRILINEAR: 'trilinear'>)], name=None, inverse_of=None, description=[], input_descriptor='', output_descriptor='', info=Info(app_release=None, copyright=None, revision=None, aces_transform_id=None, aces_user_name=None, calibration_info=None))

For writing a CLF file the write_clf function can be used to serialise a ProcessList back to XML:

xml = colour_clf_io.write_clf(clf_doc)
print(xml)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<ProcessList xmlns="urn:AMPAS:CLF:v3.0" compCLFversion="3.0" id="Example Wrapper">
    <Info/>
    <LUT3D id="lut-24" inBitDepth="12i" interpolation="trilinear" name="green look" outBitDepth="16f">
        <Description>3D LUT</Description>
        <Array dim="2 2 2 3">
            0.0 0.0 0.0
            0.0 0.0 1.0
            0.0 1.0 0.0
            0.0 1.0 1.0
            1.0 0.0 0.0
            1.0 0.0 1.0
            1.0 1.0 0.0
            1.0 1.0 1.0
        </Array>
    </LUT3D>
</ProcessList>

To execute a CLF workflow, you can create a CLFProcessList that can be applied to some input.

lut = colour_clf_io.CLFProcessList(clf_doc)
input_value = [0, 32768, 65535]
result = lut.apply(input_value)
print(result)

[ 0.  1.  1.]

1.2.1 Installation

pip install --user colour-clf-io

pip install --user 'colour-clf-io[development]'

uv add colour-clf-io

uv add colour-clf-io --optional processing

1.2.2 Contributing

If you would like to contribute to Colour - CLF IO, please refer to the following Contributing guide for Colour.

1.2.3 Bibliography

The bibliography is available in the repository in BibTeX format.

1.4.1 Publications

• Common LUT Format (CLF) - A Common File Format for Look-Up Tables by the Academy of Motion Picture Arts & Sciences.

1.4.2 Software

OpenColorIO was used to verify parsing through the builtin transforms that are part of the library.