| 14 |
|
.B "-g gamma" |
| 15 |
|
] |
| 16 |
|
{ |
| 17 |
< |
.B "in.pic|-" |
| 17 |
> |
.B "in.hdr|-" |
| 18 |
|
} |
| 19 |
|
.B out.tif |
| 20 |
|
.br |
| 28 |
|
] |
| 29 |
|
.B in.tif |
| 30 |
|
[ |
| 31 |
< |
.B "out.pic|-" |
| 31 |
> |
.B "out.hdr|-" |
| 32 |
|
] |
| 33 |
|
.SH DESCRIPTION |
| 34 |
|
.I Ra_tiff |
| 62 |
|
.I \-f |
| 63 |
|
option specifies 32-bit IEEE floating-point/primary output, which |
| 64 |
|
is the highest resolution format but results in very large files, since |
| 65 |
< |
each RGB pixel takes 96 bits (12 bytes) and there is no compression. |
| 65 |
> |
each RGB pixel takes 96 bits (12 bytes) and does not compress well. |
| 66 |
|
The |
| 67 |
|
.I \-w |
| 68 |
|
option specifies 16-bit/primary output, which is understood by |
| 74 |
|
option specifies an exposure compensation in f-stops (powers of two). |
| 75 |
|
Only integer stops are allowed, for efficiency. |
| 76 |
|
.PP |
| 77 |
+ |
If the Radiance input is a hyperspectral picture, it will be |
| 78 |
+ |
converted accurately if the output is anything but 24-bit RGB. |
| 79 |
+ |
In the latter case, the converted colors will be approximate. |
| 80 |
+ |
.PP |
| 81 |
|
The |
| 82 |
|
.I \-r |
| 83 |
|
option invokes a reverse conversion, from a TIFF image to |
| 92 |
|
.SH EXAMPLES |
| 93 |
|
To convert a Radiance picture to SGILOG-compressed TIFF format: |
| 94 |
|
.IP "" .2i |
| 95 |
< |
ra_tiff -L scene1.pic scene1.tif |
| 95 |
> |
ra_tiff \-L scene1.hdr scene1.tif |
| 96 |
|
.PP |
| 97 |
|
To later convert this image back into Radiance and display using |
| 98 |
|
human visibility tone-mapping: |
| 99 |
|
.IP "" .2i |
| 100 |
< |
ra_tiff -r scene1.tif scene1.pic |
| 100 |
> |
ra_tiff \-r scene1.tif scene1.hdr |
| 101 |
|
.br |
| 102 |
< |
ximage -e human scene1.pic |
| 102 |
> |
ximage \-e human scene1.hdr |
| 103 |
|
.SH AUTHOR |
| 104 |
< |
Greg Ward Larson |
| 104 |
> |
Greg Ward |
| 105 |
|
.br |
| 106 |
|
Sam Leffler |
| 107 |
|
.SH ACKNOWLEDGEMENT |
| 114 |
|
A gamma value other than 2.2 is not properly recorded or understood if |
| 115 |
|
recorded in the TIFF file. |
| 116 |
|
.SH "SEE ALSO" |
| 117 |
< |
pfilt(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), |
| 117 |
> |
pfilt(1), ra_bmp(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), |
| 118 |
|
ra_t16(1), ximage(1) |
