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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>viewgam</title>
<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
<meta name="author" content="Graeme Gill">
</head>
<body>
<h2><b>gamut/viewgam</b></h2>
<h3>Summary</h3>
Convert one or more gamuts into a <a href="File_Formats.html#VRML">VRML</a>
3D visualization
file. This allows visual comparison of several gamut surfaces.<br>
Also allows creating the intersection (overlap) between two gamuts.
This is useful in measuring and visualizing the coverage of one gamut
of another.<br>
<h3>Usage<br>
</h3>
<small><span style="font-family: monospace;">viewgam { [-c color] [-t
trans] [-w|s] </span><span
style="font-style: italic; font-family: monospace;">infile.gam</span><span
style="font-family: monospace;"> } ... </span><span
style="font-style: italic; font-family: monospace;">outfile.wrl</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
For each input gamut file:</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -c </span><i
style="font-family: monospace;">color</i><span
style="font-family: monospace;">
Color
to
make gamut,
r = red, g = green, b = blue</span><br style="font-family: monospace;">
<span style="font-family: monospace;">
c = cyan, m = magenta, y = yellow, w = white</span><br
style="font-family: monospace;">
<span style="font-family: monospace;">
n = natural color</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -t </span><i
style="font-family: monospace;">trans</i><span
style="font-family: monospace;">
Set
transparency
from 0.0 (opaque) to 1.0 (invisible)</span><br
style="font-family: monospace;">
<span style="font-family: monospace;"> -w
Show as a wireframe</span><br style="font-family: monospace;">
<span style="font-family: monospace;"> -s
Show as a solid surface</span><br style="font-family: monospace;">
<i style="font-family: monospace;"> infile.gam</i><span
style="font-family: monospace;"> Name
of </span><i style="font-family: monospace;">infile</i><a
style="font-family: monospace;" href="File_Formats.html#.gam">.gam</a><span
style="font-family: monospace;"> file</span><br
style="font-family: monospace;">
<br style="font-family: monospace;">
<span style="font-family: monospace;"> -n
Don't add Lab axes<br>
-i Compute
and print intersecting volume of first 2 gamuts<br>
-I isect.gam Same as -i, but save intersection gamut
to isect.gam<br style="font-family: monospace;">
</span><span style="font-family: monospace;"> </span><i
style="font-family: monospace;">outfile.wrl</i><span
style="font-family: monospace;"> Name of output
</span><i style="font-family: monospace;">outfile.wrl</i><span
style="font-family: monospace;"> file</span></small>
<br>
<h3>Usage Details and Discussion</h3>
<b>viewgam</b> creates a VRML file that allows the viewing and
comparing
of multiple gamut files by representing them as solid surfaces,
wireframes,
etc. It takes as input a list of gamut files, each file preceded by any
options that are to apply to the display of that particular
gamut.
<br>
<br>
The options that can be specified for each input gamut are:<br>
<br>
<b>-c</b> <i>color</i> allows the color of the surface or wireframe to
be
specified. Any of a number of predefined colors (red, green, blue,
cyan,
magenta, yellow, white) can be used, as well as allowing the color to
reflect
the natural color of that point in the colorspace.<br>
<br>
<b>-t</b> <i>trans</i> allows the transparency of the surface to
be
specified. A value of 0.2 might be a good place to start. Using
transparency
generally leads to a slower display than the default opaque surface
treatment, but can make it possible to see within a solid gamut surface.<br>
<br>
<b>-w</b> forces the gamut surface to be rendered as a wireframe.<br>
<br>
<b>-s</b> forces the gamut surface to be rendered as a solid surface.<br>
<br>
By default, the first gamut is treated as a solid with natural
coloring,
with the second and subsequent gamuts being wireframes with colors of
white,
red, cyan, yellow, green and blue, with decreasing visibility.<br>
<br>
The <b>-n</b> flag turns off display of the default L*a*b* axes in the
output.<br>
<br>
The <span style="font-weight: bold;">-i</span> flag computes the
intersecting volume of the first two gamuts (in cubic color units,
usually L*a*b*), as well as the volumes of the two gamuts and the
percentage the intersection is of the two gamuts. This is a useful
measure of the coverage one gamut has of another. If <span
style="font-weight: bold;">-I</span> is used, then as well as printing
the volume, the intersecting gamut will be saved to the <span
style="font-style: italic;">isect.gam</span> file.<br>
<br>
The final argument is the name of the VRML file to save the resulting
composite
3D visualization file to.<br>
<br>
</body>
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