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.\" RCSid "$Id: vgaimage.1,v 1.2 2003/12/09 15:59:07 greg Exp $" |
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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) |
