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NAME

ra_tiff - convert RADIANCE picture to/from a TIFF color or greyscale image

SYNOPSIS

ra_tiff [ -r ][ -b ][ -z ][ -g gamma ][ -e +/-stops ] input output

DESCRIPTION

Ra_tiff converts between RADIANCE and TIFF image formats. The -g option specifies the exponent used in gamma correction; the default value is 2.2, which is the recommended value for TIFF images. The -b option can be used to specify an 8-bit greyscale TIFF output file. The type of input file is determined automatically. The -z option will result in LZW compression of the TIFF output file. Decompression is automatically determined for TIFF input. The -e option specifies an exposure compensation in f-stops (powers of two). Only integer stops are allowed, for efficiency. The -r option invokes a reverse conversion, from a TIFF image to a RADIANCE picture. The RADIANCE picture file can be taken from the standard input or sent to the standard output by using a hyphen ('-') in place of the file name, but the TIFF image must be to or from a file.

AUTHOR

Greg Ward
Sam Leffler really wrote this program because he wrote the TIFF image manipulation library that was used.

ACKNOWLEDGEMENT

Work on this program was initiated and sponsored by the LESO group at EPFL in Switzerland.

BUGS

Only TIFF 8-bit greyscale and 24-bit RGB color are supported.

SEE ALSO

pfilt(1), ra_bn(1), ra_ppm(1), ra_pr(1), ra_pr24(1), ra_t8(1), ra_t16(1), ximage(1)


Header and Footer

RA_TIFF(1) RADIANCE (11/15/93) RA_TIFF(1)
Page 1 (printed 7/17/96)

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