8 |
|
][ |
9 |
|
.B "\-g gamma" |
10 |
|
][ |
11 |
< |
.B "\-e +/-stops" |
11 |
> |
.B "\-e spec" |
12 |
> |
][ |
13 |
> |
.B "-p xr yr xg yg xb yb xw yw" |
14 |
|
] |
15 |
|
[ |
16 |
|
[ |
37 |
|
.SH DESCRIPTION |
38 |
|
.I Ra_bmp |
39 |
|
converts between RADIANCE and a Windows BMP image. |
40 |
< |
The |
40 |
> |
During forward conversion, the |
41 |
|
.I \-b |
42 |
|
option produces 8-bit grayscale output rather than 24-bit RGB. |
43 |
|
The |
44 |
|
.I \-g |
45 |
< |
option specifies the exponent used in gamma correction; |
45 |
> |
option specifies the exponent used in monitor gamma correction; |
46 |
|
the default value is 2.2. |
47 |
|
The |
48 |
|
.I \-e |
49 |
< |
option specifies an exposure compensation in f-stops (powers of two |
50 |
< |
and proceeded by +/-). |
51 |
< |
Only integer stops are allowed, for efficiency. |
49 |
> |
option specifies a tone-mapping method or exposure compensation. |
50 |
> |
If the argument is one of the special words "auto", "human", or "linear", |
51 |
> |
the image will be tone-mapped with histogram adjustment, |
52 |
> |
human vision simulation, or an averaged linear exposure, |
53 |
> |
respectively. |
54 |
> |
(These words may be abbreviated by one or more letters.)\0 |
55 |
> |
Otherwise, the exposure specification is interpreted as a |
56 |
> |
linear compensation value in integer f-stops, which must |
57 |
> |
be proceeded by a '+' or '-'. |
58 |
> |
If tone-mapping is applied, then CRT output |
59 |
> |
primaries may also be specified with the |
60 |
> |
.I \-p |
61 |
> |
option. |
62 |
> |
.PP |
63 |
|
The |
64 |
|
.I \-r |
65 |
|
option invokes a reverse conversion, from a Windows BMP image |
66 |
|
to a RADIANCE picture. |
67 |
+ |
Tone-mapping and monitor primaries are not |
68 |
+ |
supported for reverse conversion. |
69 |
+ |
.PP |
70 |
|
.I Ra_bmp |
71 |
|
can accept 16-bit or color-mapped BMP files on input, |
72 |
|
but cannot not produce them on output. |