Tone Mapping¶
flowchart LR
A("ACES
RGB
Input") -->
B[ACES
to
JMh] -->
C["Tonescale
(J Only)"] -->
D["Chroma
Compression
(M Only)"] -->
E["Gamut
Compression
(J & M)"] -->
H["White
Limiting"] -->
F["Display
Encoding"] -->
G(Display
RGB
Output);
style C stroke-width:4pxTone-mapping¶
After the data is in a JMh representation, the J channel is sent through the tone scale function.
Tone-mapping Function¶
The tone mapping function is based off a Michaelis-Mentin curve, and parameterized so that certain values can be calculated automatically based on the peak luminance value.
Values¶
| ACES value | ||||
|---|---|---|---|---|
| Peak Luminance (nits) |
0 | 0.18 | 1.0 | 2.0 |
| 100 | 0.000 | 10.000 | 45.757 | 63.988 |
| 500 | 0.000 | 13.193 | 89.098 | 158.949 |
| 1000 | 0.000 | 14.512 | 106.564 | 205.783 |
| 2000 | 0.000 | 15.747 | 121.664 | 248.779 |
| 4000 | 0.000 | 16.824 | 133.883 | 284.433 |