Pearla · Color Science
Pearla Wide Gamut
Color gamut reference.
1 Introduction
Pearla Wide Gamut (PWG) is the color foundation of the Pearla ecosystem: the native gamut of the Pearl-Log recording format and the working space of Revela, Verana IV, and Joya. PWG is engineered around human vision itself. Its primaries enclose the entire chromaticity region of the CIE 1931 2° standard observer (the spectral locus closed by the line of purples), so 100% of the real color recorded by any camera is representable without clipping, while the gamut remains the tightest such container, spending no more of its encoding range on non-physical color than the geometry requires. The white point is D65, native to modern capture and display. The Pearl-Log transfer function that carries PWG in recorded files is specified in its companion document.
2 Primaries and white point
The following graph and table show Pearla Wide Gamut and its RGB primaries. The white point is defined as D65.
| Primary | x | y |
|---|---|---|
| Red | 0.7425 | 0.2689 |
| Green | -0.0521 | 1.0337 |
| Blue | 0.0785 | -0.0398 |
| White (D65) | 0.3127 | 0.3290 |
3 Conversion matrices
PWG RGB → CIE 1931 XYZ
+0.897734 -0.036290 +0.089012 +0.325119 +0.720011 -0.045130 -0.013783 +0.012816 +1.090025
CIE 1931 XYZ → PWG RGB
+1.092089 +0.056589 -0.086837 -0.491901 +1.362356 +0.096573 +0.019593 -0.015303 +0.915177
PWG RGB → ITU-R BT.709 RGB
+2.416569 -1.230936 -0.185633 -0.260783 +1.386423 -0.125639 -0.030944 -0.135338 +1.166282
ITU-R BT.709 RGB → PWG RGB
+0.460722 +0.420633 +0.118645 +0.088701 +0.809929 +0.101369 +0.022517 +0.105146 +0.872337
PWG RGB → ITU-R BT.2020 RGB
+1.428953 -0.321631 -0.107322 -0.073174 +1.188280 -0.115106 -0.011055 -0.019361 +1.030416
ITU-R BT.2020 RGB → PWG RGB
+0.710481 +0.193864 +0.095656 +0.044571 +0.855249 +0.100181 +0.008460 +0.018150 +0.973390
The PWG RGB to ACES AP0 conversion matrix is defined as a matrix including chromatic adaptation (Bradford, D65 to the ACES white point) and is shown below.
PWG RGB → ACES AP0
+0.957110 -0.034261 +0.077151 +0.001824 +1.004163 -0.005988 -0.013649 +0.015263 +0.998386
Pearla Wide Gamut color gamut reference. All chromaticities and matrices are computed from the CIE 1931 2° standard observer and verified numerically. The full specification, including coverage analysis and additional conversions, is published in the Pearla Wide Gamut white paper. © Pearla Mostra.