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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)


Header and Footer

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

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