RA_GIF(1)						      General Commands Manual							 RA_GIF(1)

NAME

       ra_gif - convert RADIANCE picture to Compuserve GIF

SYNOPSIS

       ra_gif [ -b ][ -d ][ -c ncolors ][ -g gamma ][ -e +/-stops ][ -n sampfac ] input [ output ]

DESCRIPTION

       Ra_gif converts from RADIANCE to Compuserve GIF color-mapped, compressed image files.  In the default mode, a RADIANCE picture is converted
       to a color-mapped GIF file of the same horizontal and vertical dimensions with 8-bits per pixel.  The -b option converts the image to black
       and  white.   The  -d  option  turns  off dithering.  The -c option allows fewer than 256 colors (and fewer than 8 bits per pixel).  The -g
       option specifies the exponent used in gamma correction; the default value is 2.2.  An exponent of 1.0 turns gamma correction off.   The	-e
       option specifies an exposure compensation in f-stops (powers of two).  Only integer stops are allowed, for efficiency.  The -n option spec-
       ifies a sampling factor for neural network color quantization.  This value should be between 1 and 80, where 1 takes the longest  and  pro-
       duces  the  best  results in small areas of the image.  If no value is given, a faster median cut algorithm is used.  If the output file is
       missing, the standard output is used.

AUTHORS

       Greg Ward
       Paul Haeberli
       David Rowley
       Anthony Dekker provided the code for neural network color quantization

SEE ALSO

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

RADIANCE
							      6/10/94								 RA_GIF(1)