Explanation of Gamma Transfer 1D LUT (1D Look-Up Table) and Gamut / Gamma Transfer 3D LUT (3D Look-Up Table) for cameras.
Article ID: ART170391 | | | Date published: 05/18/2018 | | | Date last updated: 06/21/2019 |
Description
Explanation of Gamma Transfer 1D LUT (1D Look-Up Table) and Gamut / Gamma Transfer 3D LUT (3D Look-Up Table) for EOS C700, EOS C300 Mark II, EOS C200, EOS C300, EOS C100 Mark II, EOS C100, ME20F-SH, ME200S-SH, XC10, XC15, and XF705
Solution
Gamma Transfer 1D LUT (1D Look-Up Table, Version 2.2
Gamut / Gamma Transfer 3D LUT (3D Look-Up Table), Version 1.1
- LUT Category
Viewing LUT
- LUT Overview
A 1D LUT that converts from Canon Log / Canon Log 2 / Canon Log 3 gamma
- File Format
.cube format
- Applicable Models
Different 1D LUTs are used because different products have different gamma settings.
Check the correspondence table below before use.
[Group 1]
EOS C700, EOS C300 Mark II, EOS C200
[Group 2]
EOS C300, EOS C100 Mark II, EOS C100, ME20F-SH, ME200S-SH, XC10, XC15
[Group 3]
XF705
- Correspondence Table
Input | Output | Group | |||||
Gamma | Range | Bits | Gamma | Range | 1 | 2 | 3 |
Canon Log | Full | 10/12/2016 | BT.709 (Gamma 2.2) |
Full, Narrow |
✔ | ✔ | |
Canon Log | Full | 10/12/2016 | Wide DR | Full, Narrow |
✔ | ✔ | |
Canon Log | Full | 10/12/2016 | Cineon | Full | ✔ | ✔ | |
Canon Log | Full | 10/12/2016 | DCI (Gamma 2.6) | Full | ✔ | ✔ | |
Canon Log | Full | 10/12/2016 | Linear | Linear | ✔ | ✔ | |
Canon Log 2 | Full | 10/12/2016 | BT.709 (Gamma 2.2) |
Full, Narrow |
✔ | ||
Canon Log 2 | Full | 10/12/2016 | Wide DR | Full, Narrow |
✔ | ||
Canon Log 2 | Full | 10/12/2016 | PQ | Full, Narrow |
✔ | ||
Canon Log 2 | Full | 10/12/2016 | HLG | Full, Narrow |
✔ | ||
Canon Log 2 | Full | 10/12/2016 | Cineon | Full | ✔ | ||
Canon Log 2 | Full | 10/12/2016 | DCI (Gamma 2.6) | Full | ✔ | ||
Canon Log 2 | Full | 10/12/2016 | Canon Log 3 | Full | ✔ | ||
Canon Log 2 | Full | 10/12/2016 | Linear | Linear | ✔ | ||
Canon Log 3 | Full | 10/12/2016 | BT.709 (Gamma 2.2) |
Full, Narrow |
✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | Wide DR | Full, Narrow |
✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | PQ | Full, Narrow |
✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | HLG | Full, Narrow |
✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | Cineon | Full | ✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | DCI (Gamma 2.6) | Full | ✔ | ✔ | |
Canon Log 3 | Full | 10/12/2016 | Linear | Linear | ✔ | ✔ |
- File naming convention
[Gamma]_[BitNum]-to-[Gamma]_[Range][Range]_[Version].cube
(1) (2) (3) (4) (5) (6) - Example:CanonLog_10-to-BT709_FF_Ver.2.0.cube
- Input gamma
- Input bit depth
- Output gamma
- Input range (N: Narrow, F: Full)
- Output range (N: Narrow, F: Full, L: Linear)
- Version
- Explanation of the data format
Example: Canon Log 2 to Cineon 10-bit version
Lines beginning with the pound sign (#) Comments about the 1D LUT file LUT_1D_SIZE_1024 Size of the 1D LUT 0.000000 0.000000 0.000000 0.000510 0.000510 0.000510 0.001728 0.001728 0.001728 0.002946 0.002946 0.002946
- Explanation of Linear LUTs
-0.016363 -0.016363. -0.016363 Indicates the data are Scene Linear values -0.016298 -0.016298 -0.016298 Example: 0.200000 = 20% (18% Grey) -0.016234 -0.016234 -0.016234 1.000000 = 100% (90% White) -0.016169 -0.016169 -0.016169
- LUTs for conversions to Wide DR
The Narrow range version of Wide DR is a curve that was used into the super-whites
(outputs over 100%), whereas with the Full range version of Wide DR, this curve is
compressed in a format to fit within 100% output.
- Nominal signal levels of conversion LUT from Canon Log 2/3 to PQ/HLG
These LUT are used to convert to the perceptual quantization (PQ) and Hybrid Log-Gamma (HLG) defined by Recommendation ITU-R BT.2100-2.
Conversion is performed to achieve the signal levels described in TABLE 1 of Report ITU-R BT.2408-1.
- Reference: Gamma data values at different brightnesses
Gamma Range Scene Linear % (Reflection %) 0%
(0% Black)20%
(18% Grey)100%
(90% White)800% 1600% 6400% Canon Log Full 0.1251 0.3434 0.5998 0.9929 - - Canon Log 2 Full 0.0929 0.3983 0.5623 0.7792 0.8518 0.9971 Canon Log 3 Full 0.1251 0.3434 0.5645 0.8872 0.9971 - Cineon Full 0.0928 0.4697 0.6691 0.9325 - - DCI
(Gamma 2.6)Full 0.0000 0.4622 0.7938 1.0000 - - Wide DR Full 0.0000 0.3963 0.7294 0.9927 - - Narrow 0.0625 0.4340 0.7463 0.9931 - - BT.709
(Gamma 2.2)Full 0.0000 0.4337 1.0000 - - - Narrow 0.0625 0.4336 0.9182 - - - PQ Full 0.0000 0.3790 0.5679 0.8216 0.9048 - Narrow 0.0625 0.3868 0.5485 0.7655 0.8367 0.9734 HLG Full 0.0000 0.3781 0.7291 - - - Narrow 0.0625 0.3861 0.6864 - - -
Gamut / Gamma Transfer 3D LUT (3D Look-Up Table), Version 1.1
- LUT Category
Viewing LUT
- LUT Overview
A 3D LUT that converts from Cinema Gamut / DCI-P3 Gamut / BT.2020 Gamut / BT.709 Gamut and Canon Log / Canon Log 2 / Canon Log 3
- File format
.cube format
- Applicable Models
Different 3D LUTs are used because different products have different gamma settings.
Check the correspondence table below before use.
[Group 1]
EOS C700, EOS C300 Mark II, EOS C200
[Group 2]
EOS C300, EOS C100 Mark II, EOS C100, ME20F-SH, ME200S-SH, XC10, XC15
[Group 3]
XF705
- Correspondence Table
Input | Output | Applicable Group | |||||||
Gamut | Gamma | Range | Gamut | Gamma | Range | Grids | 1 | 2 | 3 |
Cinema Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
BT.709 (Gamma 2.2) |
Full, Narrow |
17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | DCI-P3 Gamut |
DCI (Gamma 2.6) |
Full | 17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.2020 Gamut |
BT.709 (Gamma 2.2) |
Full, Narrow |
17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.2020 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log 2 Canon Log 3 |
Full | BT.2020 Gamut |
PQ | Full, Narrow |
17,33,65 | ✔ | ||
Cinema Gamut |
Canon Log 2 Canon Log 3 |
Full | BT.2020 Gamut |
HLG | Full, Narrow |
17,33,65 | ✔ | ||
DCI-P3 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
BT.709 (Gamma 2.2) |
Full, Narrow |
17,33,65 | ✔ | ||
DCI-P3 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ||
DCI-P3 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | DCI-P3 Gamut |
DCI (Gamma 2.6) |
Full | 17,33,65 | ✔ | ||
BT.2020 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
BT.709 (Gamma 2.2) |
Full, Narrow |
17,33,65 | ✔ | ✔ | |
BT.2020 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ✔ | |
BT.2020 Gamut |
Canon Log Canon Log 2 Canon Log 3 |
Full | BT.2020 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ✔ | |
BT.709 Gamut |
Canon Log | Full | BT.709 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ✔ | |
BT.709 Gamut |
Canon Log 2 Canon Log 3 |
Full | BT.709 Gamut |
Wide DR | Full, Narrow |
17,33,65 | ✔ | ✔ | |
BT.2020 Gamut |
Wide DR | Narrow | BT.709 Gamut |
Wide DR | Narrow | 17,33,65 | ✔ | ✔ |
- File naming conventions
[Gamut]_[Gamma]-to-[Gamut]_[Gamma]_[GridNum]_[Range][Range]_[Version].cube
(1) (2) (3) (4) (5) (6) (7) (8)
- Input gamut
- Input gamma
- Output gamut
- Output gamma
- Grids
- Input range (N: Narrow, F: Full)
- Output range (N: Narrow, F: Full, L: Linear)
- Version
- Explanation of the data format
Example: 17 Grid version
Lines beginning with the pound sign (#) Comments about the 3D LUT file LUT_3D_SIZE 17 Table size (17 x 17 x 17) 0.000000 0.000000 0.000000 Data (R G B, red fastest) 0.000026 0.000000 0.000000 0.079094 0.000000 0.001118 0.205855 0.000250 0.000000
- LUTs for conversions to Wide DR
The Narrow range version of Wide DR is a curve that was used into the super-whites
(outputs over 100%), whereas with the Full range version of Wide DR, this curve is
compressed in a format to fit within 100% output.
- Nominal signal levels of conversion LUT from Canon Log 2/3 to PQ/HLG
These LUT are used to convert to the perceptual quantization (PQ) and Hybrid Log-Gamma (HLG) defined by Recommendation ITU-R BT.2100-2.
Conversion is performed to achieve the signal levels described in TABLE 1 of Report ITU-R BT.2408-1.
- HLG-Vivid
This HLG corresponds to the traditional colour described in section 6.5 of Report ITU-R BT.2390-4.
This results in expression with higher saturation than that of the BT.2100 compliant HLG.