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Add LogC v3 EI presets #19

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c7db253
add transforms for LogC-to-ACES transforms, with same EI values as in…
scottdyer Oct 7, 2025
8c1f434
add transforms for ACES-to-LogC, for EI values below 1600
scottdyer Oct 7, 2025
d6a566d
add missed header info for EI800 and EI1000 transform and incorrect E…
scottdyer Oct 15, 2025
3363cd9
refactor to put LogC constants and functions in an import file
scottdyer Oct 15, 2025
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52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI1000.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI1000.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI1000</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI1000
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI1000
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 1000.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI1280.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI1280.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI1280</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI1280
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI1280
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 1280.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI160.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI160.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI160</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI160
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI160
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 160.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI200.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI200.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI200</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI200
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI200
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 200.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI250.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI250.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI250</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI250
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI250
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 250.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI320.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI320.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI320</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI320
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI320
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 320.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
52 changes: 52 additions & 0 deletions arri/CSC.Arri.ACES_to_LogCv3-EI400.ctl
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// <ACEStransformID>urn:ampas:aces:transformId:v2.0:CSC.Arri.ACES_to_LogC3-EI400.a2.v1</ACEStransformID>
// <ACESuserName>ACES2065-1 to ARRI LogC3 EI400</ACESuserName>

//
// ACES Color Space Conversion - ACES2065-1 to Arri LogC3 EI400
//
// converts ACES2065-1 (AP0 w/ linear encoding) to
// Arri LogC3 EI400
//

import "Lib.Academy.Utilities";
import "Lib.Academy.ColorSpaces";
import "Lib.Arri.LogC3";

const Chromaticities AP0 = // ACES Primaries from SMPTE ST2065-1
{
{0.73470, 0.26530},
{0.00000, 1.00000},
{0.00010, -0.07700},
{0.32168, 0.33767}};

const Chromaticities ARRI_ALEXA_WG_PRI =
{
{0.68400, 0.31300},
{0.22100, 0.84800},
{0.08610, -0.10200},
{0.31270, 0.32900}};

const float AP0_to_AWG3_MAT[3][3] = calculate_rgb_to_rgb_matrix(AP0,
ARRI_ALEXA_WG_PRI,
CONE_RESP_MAT_CAT02);

const float EI = 400.0;

void main(input varying float rIn,
input varying float gIn,
input varying float bIn,
input varying float aIn,
output varying float rOut,
output varying float gOut,
output varying float bOut,
output varying float aOut)
{
float ACES[3] = {rIn, gIn, bIn};

float lin_AWG3[3] = mult_f3_f33(ACES, AP0_to_AWG3_MAT);

rOut = relativeExposureToNormalizedLogC3(lin_AWG3[0], EI);
gOut = relativeExposureToNormalizedLogC3(lin_AWG3[1], EI);
bOut = relativeExposureToNormalizedLogC3(lin_AWG3[2], EI);
aOut = aIn;
}
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