| 1 |
< |
.\" RCSid "$Id" |
| 1 |
> |
.\" RCSid "$Id$" |
| 2 |
|
.TH PEXTREM 1 11/15/93 RADIANCE |
| 3 |
|
.SH NAME |
| 4 |
|
pextrem - find minimum and maximum values in RADIANCE picture |
| 5 |
|
.SH SYNOPSIS |
| 6 |
|
.B pextrem |
| 7 |
|
[ |
| 8 |
< |
.B \-o |
| 8 |
> |
.B "-o | -O" |
| 9 |
|
] |
| 10 |
|
[ |
| 11 |
|
picture |
| 25 |
|
.I \-o |
| 26 |
|
option prints the original (radiance) values, undoing any exposure |
| 27 |
|
or color correction done on the picture. |
| 28 |
+ |
If the input is XYZE, then the second channel is in candelas/meter^2, |
| 29 |
+ |
unless |
| 30 |
+ |
.I \-O |
| 31 |
+ |
is specified, when watts/sr/meter^2 are always reported. |
| 32 |
|
.PP |
| 33 |
|
If no input |
| 34 |
|
.I picture |
| 35 |
|
is given, the standard input is read. |
| 36 |
< |
.SH AUTHOR |
| 33 |
< |
Greg Ward |
| 34 |
< |
.SH BUGS |
| 36 |
> |
.SH NOTES |
| 37 |
|
The luminance value is used for comparison of pixels, although in |
| 38 |
|
certain anomolous cases (ie. highly saturated colors) it is possible that |
| 39 |
|
.I pextrem |
| 41 |
|
This is because a fast integer-space comparison is used. |
| 42 |
|
A more reliable floating-point comparison would be slower by |
| 43 |
|
an order of magnitude. |
| 44 |
+ |
.PP |
| 45 |
+ |
Hyperspectral pictures report min/max values as RGB colors for |
| 46 |
+ |
output consistency. |
| 47 |
+ |
.SH AUTHOR |
| 48 |
+ |
Greg Ward |
| 49 |
|
.SH "SEE ALSO" |
| 50 |
|
falsecolor(1), getinfo(1), pcomb(1), pcompos(1), pextrem(1), pfilt(1), |
| 51 |
|
pflip(1), protate(1), psign(1), rpict(1), ximage(1) |
