VGAIMAGE(1)

NAME
vgaimage - RADIANCE picture display program for VGA

SYNOPSIS
vgaimage [ -c ncolors ][ -d ][ -b ][ -m ][ -g gamma ][ -e +/-stops ] pixfile

DESCRIPTION
Vgaimage takes the RADIANCE picture file pixfile and displays it on a VGA or Super VGA card. The -c option specifies the number of colors to use (default fills color table). The -d option turns off color dithering. The -b option displays the image in black and white (greyscale). The -m option forces monochrome output. The -g option specifies the exponent used in gamma correction; the default value is given by the environment variable GAMMA, or 2.2 if GAMMA is undefined. The -e option specifies an exposure compensation in f-stops (powers of two). Only integer stops are allowed, for efficiency.

If no pixfile is given, input is read from stdin provided either the -b or -m option is in effect.

COMMANDS
Once a picture is displayed, the user may perform a number of operations. Some of the operations make use of an area of interest, defined by pressing a mouse button and dragging the cursor over a section of the image. Pressing a button and immediately releasing it defines a single point as the area of interest. A command is a single character.

q   Quit program.

<return>
    Display the radiance averaged over the area of interest.

l   Display the luminance value in the area of interest.

c   Display the color in the area of interest.

ENVIRONMENT
GAMMA    the default gamma correction value

AUTHORS
Greg Ward

SEE ALSO
aedimage(1), pfilt(1), rpict(1), rtrace(1), ximage(1)