| 210 |
|
included in the other material parameters. All colors are absolute, |
| 211 |
|
e.g. spectral reflectance or transmittance under uniform white light. |
| 212 |
|
|
| 213 |
< |
A CIE xy chromaticity pair is the most basic color specification. |
| 214 |
< |
A full spectrum is the most general specification, and the starting |
| 215 |
< |
(i.e. minimum) and ending (i.e. maximum) wavelengths are given along |
| 216 |
< |
with a set of evenly spaced values. Wavelengths are given in nanometers, |
| 217 |
< |
and must be within the range of 380-780. The spectral values themselves |
| 218 |
< |
are located starting at the first wavelength and proceeding at even |
| 219 |
< |
increments to the ending wavelength. The values in between will be |
| 220 |
< |
interpolated as necessary, so there must be at least two specified points. |
| 221 |
< |
The color mixing entity is intended not only for the mixing of named |
| 222 |
< |
colors, but also for color specifications using an arbitrary set |
| 223 |
< |
of basis functions. The actual totals for spectral and mixing |
| 224 |
< |
coefficients is irrelevant, since the results will be normalized. |
| 213 |
> |
A CIE xy chromaticity pair is the most basic color specification. A |
| 214 |
> |
full spectrum is the most general specification, and the starting (i.e. |
| 215 |
> |
minimum) and ending (i.e. maximum) wavelengths are given along with a |
| 216 |
> |
set of evenly spaced values. Wavelengths are given in nanometers, and |
| 217 |
> |
must be within the range of 380-780. The spectral values themselves, |
| 218 |
> |
which can be thought of as relative power density per nanometer, start |
| 219 |
> |
at the first wavelength and proceed at even increments to the last |
| 220 |
> |
wavelength. The values in between will be interpolated as necessary, |
| 221 |
> |
so there must be at least two specified points. The color mixing |
| 222 |
> |
entity is intended not only for the mixing of named colors, but also |
| 223 |
> |
for color specifications using an arbitrary set of basis functions. |
| 224 |
> |
The mixing coefficients are in effect relative luminances for each |
| 225 |
> |
color "primary." The actual total of the mixing coefficients or |
| 226 |
> |
spectral values is irrelevant, since the results will always be |
| 227 |
> |
normalized. |
| 228 |
|
|
| 229 |
|
Diffuse emittance is always given in SI units of lumens/meter^2. Note that |
| 230 |
|
this is emittance, not exitance, and does not include light reflected or |
