| 689 |
|
divided by the given |
| 690 |
|
.I frac. |
| 691 |
|
.TP |
| 692 |
< |
.BR -ld |
| 692 |
> |
.BR \-ld |
| 693 |
|
Boolean switch to limit ray distance. |
| 694 |
|
If this option is set, then rays will only be traced as far as the |
| 695 |
|
magnitude of each direction vector. |
| 696 |
|
Otherwise, vector magnitude is ignored and rays are traced to infinity. |
| 697 |
+ |
.TP |
| 698 |
+ |
.BI -cs \ Ns |
| 699 |
+ |
Use |
| 700 |
+ |
.I Ns |
| 701 |
+ |
bands for spectral sampling rather than the default RGB calculation space. |
| 702 |
+ |
The maximum setting is controlled by the compiler macro MAXCSAMP, and |
| 703 |
+ |
defaults to 24. |
| 704 |
+ |
Larger values for Ns will be reduced to MAXCSAMP. |
| 705 |
+ |
.TP |
| 706 |
+ |
.BI -cw " nmA nmB" |
| 707 |
+ |
Set extrema to the given wavelengths for spectral sampling. |
| 708 |
+ |
The default is 380 and 780 nanometers. |
| 709 |
+ |
The order specified does not matter. |
| 710 |
+ |
.TP |
| 711 |
+ |
.BR \-co |
| 712 |
+ |
Boolean switch turns on spectral data output if selected. |
| 713 |
+ |
The default is to reduce spectral results to RGB, but see the related |
| 714 |
+ |
.I \-p* |
| 715 |
+ |
options, below. |
| 716 |
+ |
.TP |
| 717 |
+ |
.BI -pc " xr yr xg yg xb yb xw yw" |
| 718 |
+ |
Use the specified chromaticity pairs for output primaries and white |
| 719 |
+ |
point rather than the standard RGB color space. |
| 720 |
+ |
.TP |
| 721 |
+ |
.BR \-pRGB |
| 722 |
+ |
Output standard RGB values (the default). |
| 723 |
+ |
.TP |
| 724 |
+ |
.BR \-pXYZ |
| 725 |
+ |
Output standard CIE XYZ tristimulus values rather than RGB. |
| 726 |
+ |
.TP |
| 727 |
+ |
.BR \-pY |
| 728 |
+ |
Produce a single output channel corresponding to photopic spectral |
| 729 |
+ |
sensitivity. |
| 730 |
+ |
.TP |
| 731 |
+ |
.BR \-pS |
| 732 |
+ |
Produce a single output channel corresponding to scotopic spectral |
| 733 |
+ |
sensitivity. |
| 734 |
+ |
.TP |
| 735 |
+ |
.BR \-pM |
| 736 |
+ |
Produce a single output channel corresponding to melanopic spectral |
| 737 |
+ |
sensitivity. |
| 738 |
|
.TP |
| 739 |
|
.BI -e \ efile |
| 740 |
|
Send error messages and progress reports to |
