gamut/viewgam
Summary
Convert one or more gamuts into a VRML
3D visualization
file. This allows visual comparison of several gamut surfaces.
Also allows creating the intersection (overlap) between two gamuts.
This is useful in measuring and visualizing the coverage of one gamut
of another.
Usage
viewgam { [-c color] [-t
trans] [-w|s] infile.gam } ... outfile.wrl
For each input gamut file:
-c color
Color
to
make gamut,
r = red, g = green, b = blue
c = cyan, m = magenta, y = yellow, w = white
n = natural color
-t trans
Set
transparency
from 0.0 (opaque) to 1.0 (invisible)
-w
Show as a wireframe
-s
Show as a solid surface
infile.gam Name
of infile.gam file
-n
Don't add Lab axes
-i Compute
and print intersecting volume of first 2 gamuts
-I isect.gam Same as -i, but save intersection gamut
to isect.gam
outfile.wrl Name of output
outfile.wrl file
Usage Details and Discussion
viewgam 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.
The options that can be specified for each input gamut are:
-c color 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.
-t trans 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.
-w forces the gamut surface to be rendered as a wireframe.
-s forces the gamut surface to be rendered as a solid surface.
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.
The -n flag turns off display of the default L*a*b* axes in the
output.
The -i 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 -I is used, then as well as printing
the volume, the intersecting gamut will be saved to the isect.gam file.
The final argument is the name of the VRML file to save the resulting
composite
3D visualization file to.