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.\" RCSid "$Id"
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.TH VGAIMAGE 1 11/15/93 RADIANCE
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.SH NAME
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vgaimage - RADIANCE picture display program for VGA
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.SH SYNOPSIS
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.B vgaimage
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[
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.B "\-c ncolors"
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][
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.B \-d
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][
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.B \-b
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][
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.B \-m
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][
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.B "\-g gamma"
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][
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.B "\-e +/-stops"
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]
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.B pixfile
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.SH DESCRIPTION
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.I Vgaimage
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takes the RADIANCE picture file
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.I pixfile
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and displays it on a VGA or Super VGA card.
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The
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.I \-c
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option specifies the number of colors to use (default fills color table).
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The
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.I \-d
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option turns off color dithering.
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The
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.I \-b
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option displays the image in black and white (greyscale).
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The
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.I \-m
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option forces monochrome output.
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The
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.I \-g
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option specifies the exponent used in gamma correction;
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the default value is given by the environment variable GAMMA, or
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2.2 if GAMMA is undefined.
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The
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.I \-e
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option specifies an exposure compensation in f-stops (powers of two).
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Only integer stops are allowed, for efficiency.
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.PP
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If no
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.I pixfile
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is given, input is read from stdin provided either the
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.I \-b
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or
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.I \-m
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option is in effect.
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.SH COMMANDS
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Once a picture is displayed, the user
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may perform a number of operations.
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Some of the operations make use of an area of interest, defined by pressing
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a mouse button and dragging the cursor over a section of the image.
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Pressing a button and immediately releasing it defines a single point as
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the area of interest.
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A command is a single character.
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.TP 10n
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.BR q
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Quit program.
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.TP
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.BR <return>
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Display the radiance averaged over the area of interest.
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.TP
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.BR l
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Display the luminance value in the area of interest.
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.TP
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.BR c
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Display the color in the area of interest.
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.SH ENVIRONMENT
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GAMMA the default gamma correction value
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.SH AUTHORS
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Greg Ward
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.SH "SEE ALSO"
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aedimage(1), pfilt(1), rpict(1), rtrace(1), ximage(1)
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