| 140 |
|
will return a negative value, and |
| 141 |
|
.I S(n) |
| 142 |
|
will return zero. |
| 143 |
+ |
The first input picture with a view is assumed to correspond to the |
| 144 |
+ |
view of the output picture, which is written into the header. |
| 145 |
|
.PP |
| 146 |
|
The |
| 147 |
|
.I \-h |
| 208 |
|
.PP |
| 209 |
|
To precompute the gamma correction for a picture: |
| 210 |
|
.IP "" .2i |
| 211 |
< |
pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' pic > pic.gam |
| 211 |
> |
pcomb \-e 'ro=ri(1)^.4;go=gi(1)^.4;bo=bi(1)^.4' inp.hdr > gam.hdr |
| 212 |
|
.PP |
| 213 |
|
To perform some special filtering: |
| 214 |
|
.IP "" .2i |
| 215 |
< |
pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.pic > filtered.pic |
| 215 |
> |
pcomb \-f myfilt.cal \-x xmax/2 \-y ymax/2 input.hdr > filtered.hdr |
| 216 |
|
.PP |
| 217 |
|
To make a picture of a dot: |
| 218 |
|
.IP "" .2i |
