Radiance 3.5 User Manual

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vgaimage (1)


vgaimage - RADIANCE picture display program for VGA


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


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.


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.
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.


GAMMA the default gamma correction value


Greg Ward


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