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.\" RCSid "$Id" |
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.TH RA_T16 1 11/15/93 RADIANCE |
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.SH NAME |
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ra_t16 - convert RADIANCE picture to/from Targa 16 or 24-bit image file |
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.SH SYNOPSIS |
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.B ra_t16 |
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[ |
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.B \-2 |
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][ |
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.B \-3 |
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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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.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_t16 |
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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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.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_t16 |
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converts between RADIANCE and Targa 16-bit or 24-bit RGB image files |
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(type 2 in Targa's documentation). |
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In the default mode, a RADIANCE picture is converted to an |
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RGB file of the same horizontal and vertical dimensions with |
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16-bits per pixel. |
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The |
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.I \-3 |
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option tells the program to produce a 24-bit image file instead. |
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The |
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.I \-g |
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option specifies the exponent used in gamma correction; |
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the default value is 2.2. |
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An exponent of 1.0 turns gamma correction off. |
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The |
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.I \-e |
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option specifies an exposure compensation in f-stops (powers of two). |
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Only integer stops are allowed, for efficiency. |
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The |
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.I \-r |
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option invokes a reverse conversion, from a 16-bit or 24-bit |
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Targa file to a RADIANCE picture. |
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The determination of depth is made automatically on reverse |
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translation, so the |
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.I \-2 |
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and |
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.I \-3 |
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options are not necessary. |
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If the output file is missing, the standard output is used. |
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.SH AUTHORS |
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Greg Ward |
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.SH BUGS |
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Run-length encoded files can be read but not written with this |
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program. |
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.SH "SEE ALSO" |
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pfilt(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), |
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ra_t8(1), ra_tiff(1), ximage(1) |
