def create_inverse_eotf_group()

in src/open_vp_cal/core/ocio_config.py [0:0]

• 35 lines of code
• 6 McCabe index (conditional complexity)

    def create_inverse_eotf_group(tgt_eotf: str) -> ocio.GroupTransform:
        """ Create an OCIO group transform for the inverse EOTF

        Args:
            tgt_eotf: The target EOTF

        Returns: The OCIO group transform for the inverse EOTF

        """
        inverse_eotf_group_transform = ocio.GroupTransform()
        if tgt_eotf:
            if tgt_eotf.startswith("gamma "):
                gamma = float(tgt_eotf[5:])
                inverse_eotf_group_transform.appendTransform(
                    ocio.ExponentTransform(
                        value=[gamma, gamma, gamma, 1],
                        negativeStyle=ocio.NegativeStyle.NEGATIVE_PASS_THRU,
                        direction=ocio.TransformDirection.TRANSFORM_DIR_INVERSE)
                )
            elif tgt_eotf == EOTF.EOTF_ST2084:
                # OCIO PQ builtin expects 1 to be 100nits
                inverse_eotf_group_transform.appendTransform(
                    ocio.BuiltinTransform(
                        "CURVE - ST-2084_to_LINEAR",
                        direction=ocio.TransformDirection.TRANSFORM_DIR_INVERSE,
                    )
                )
            elif tgt_eotf == EOTF.EOTF_BT1886:
                inverse_eotf_group_transform.appendTransform(
                    ocio.ExponentTransform(
                        value=2.4, negativeStyle=ocio.NegativeStyle.NEGATIVE_PASS_THRU,
                        direction=ocio.TransformDirection.TRANSFORM_DIR_INVERSE,
                    )
                )
            elif tgt_eotf == EOTF.EOTF_SRGB:
                inverse_eotf_group_transform.appendTransform(
                    ocio.ExponentWithLinearTransform(
                        gamma=[2.4, 2.4, 2.4, 2.4], offset=[0.055, 0.055, 0.055, 0.055],
                        direction=ocio.TransformDirection.TRANSFORM_DIR_INVERSE,
                    )
                )
            else:
                raise RuntimeError("Unknown EOTF: " + tgt_eotf)
        return inverse_eotf_group_transform