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.TH RA_BMP 1 3/25/04 RADIANCE |
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.SH NAME |
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ra_bmp - convert RADIANCE picture to/from Windows BMP image |
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.SH SYNOPSIS |
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.B ra_bmp |
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[ |
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.B \-b |
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][ |
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.B "\-g gamma" |
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][ |
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.B "\-e spec" |
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][ |
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.B "-p xr yr xg yg xb yb xw yw" |
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] |
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[ |
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[ |
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.B input|- |
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[ |
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.B output |
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] |
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] |
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.br |
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.B ra_bmp |
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.B \-r |
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[ |
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.B "\-g gamma" |
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][ |
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.B "\-e +/-stops" |
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] |
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[ |
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[ |
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.B input|- |
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[ |
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.B output |
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] |
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] |
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.SH DESCRIPTION |
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.I Ra_bmp |
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converts between RADIANCE and a Windows BMP image. |
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During forward conversion, the |
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.I \-b |
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option produces 8-bit grayscale output rather than 24-bit RGB. |
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The |
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.I \-g |
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option specifies the exponent used in monitor gamma correction; |
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the default value is 2.2. |
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The |
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.I \-e |
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option specifies a tone-mapping method or exposure compensation. |
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If the argument is one of the special words "auto", "human", or "linear", |
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the image will be tone-mapped with histogram adjustment, |
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human vision simulation, or an averaged linear exposure, |
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respectively. |
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(These words may be abbreviated by one or more letters.)\0 |
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Otherwise, the exposure specification is interpreted as a |
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linear compensation value in integer f-stops, which must |
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be proceeded by a '+' or '-'. |
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The CRT color output primaries may be specified with the |
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.I \-p |
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option. |
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.PP |
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The |
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.I \-r |
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option invokes a reverse conversion, from a Windows BMP image |
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to a RADIANCE picture. |
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Tone-mapping and monitor primaries are not |
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supported for reverse conversion. |
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.PP |
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.I Ra_bmp |
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can accept 16-bit or color-mapped BMP files on input, |
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but cannot not produce them on output. |
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.PP |
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A hyphen ('-') may be specified to indicate standard input for |
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either forward or reverse conversion so that an output file may be |
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specified. |
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If the BMP input is taken from the standard input or sent to the |
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standard output without tone-mapping, then the scanlines may |
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be reversed from their usual ordering. |
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Scanlines are also reversed when output to a BMP file without |
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tone-mapping using the grayscale option. |
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Reversed scanlines sometimes causes difficulties for programs attempting |
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to interpret the resulting RADIANCE picture or BMP image, which |
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may be rejected or displayed inverted. |
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.SH AUTHOR |
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Greg Ward |
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.SH "SEE ALSO" |
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pfilt(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1), |
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ra_tiff(1), ximage(1) |
