---
name: "ra_gif"
section: "1"
platform: "linux"
package: "radiance"
version: "4R1+20120125-1+b1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/ra_gif"
---

# ra\_gif(1)

convert RADIANCE picture to Compuserve GIF

## 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 specifies a sampling factor for neural network color quantization. This value should be between 1 and 80, where 1 takes the longest and produces 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)](/pfilt/1.md), [ra\_bmp(1)](/ra_bmp/1.md), ra\_bn(1), [ra\_ppm(1)](/ra_ppm/1.md), ra\_pr(1), ra\_pr24(1), [ra\_t8(1)](/ra_t8/1.md), [ra\_t16(1)](/ra_t16/1.md), [ra\_tiff(1)](/ra_tiff/1.md), [ximage(1)](/ximage/1.md)