ra_gif(1) [debian man page]

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)

RA_BMP(1)						      General Commands Manual							 RA_BMP(1)

NAME

       ra_bmp - convert RADIANCE picture to/from Windows BMP image

SYNOPSIS

       ra_bmp [ -b ][ -g gamma ][ -e spec ][ -p xr yr xg yg xb yb xw yw ] [ [ input|- [ output ] ]
       ra_bmp -r [ -g gamma ][ -e +/-stops ] [ [ input|- [ output ] ]

DESCRIPTION

       Ra_bmp  converts between RADIANCE and a Windows BMP image.  During forward conversion, the -b option produces 8-bit grayscale output rather
       than 24-bit RGB.  The -g option specifies the exponent used in monitor gamma correction; the default value is 2.2.  The -e option specifies
       a  tone-mapping	method or exposure compensation.  If the argument is one of the special words "auto", "human", or "linear", the image will
       be tone-mapped with histogram adjustment, human vision simulation, or an averaged linear  exposure,  respectively.   (These  words  may	be
       abbreviated  by	one  or  more letters.)  Otherwise, the exposure specification is interpreted as a linear compensation value in integer f-
       stops, which must be proceeded by a '+' or '-'.	The CRT color output primaries may be specified with the -p option.

       The -r option invokes a reverse conversion, from a Windows BMP image to a RADIANCE picture.  Tone-mapping and  monitor  primaries  are  not
       supported for reverse conversion.

       Ra_bmp can accept 16-bit or color-mapped BMP files on input, but cannot not produce them on output.

       A  hyphen  ('-')  may be specified to indicate standard input for either forward or reverse conversion so that an output file may be speci-
       fied.  If the BMP input is taken from the standard input or sent to the standard output without tone-mapping, then  the	scanlines  may	be
       reversed  from  their  usual ordering.  Reversed scanlines sometimes causes difficulties for programs attempting to interpret the resulting
       RADIANCE picture or BMP image, which may be rejected or displayed inverted.

AUTHOR

       Greg Ward

SEE ALSO

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

RADIANCE
							      3/25/04								 RA_BMP(1)