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Through the "Display Utilities" pull-down menu, three of \fPviewimage\fP's 
subforms can be accessed. The subforms 
deal with psuedocoloring an image, using the interactive lookup table to 
change the colormap of an image, and thresholding an image.  Note that 
these three subforms are identical in appearance and function as the 
subforms by the same name in the \fBeditimage\fP program.
The action button found on the "Display Utilities" pull-down menu
allow you to change the band that is currently displayed.
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1) Interactive LUT
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The first subform, \fIInteractive LUT\fP, brings up the subform which allows 
you to use the interactive look up table to change the colormap of the 
currently displayed image.
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2) Psuedocoloring
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The second subform, \fIPsuedocolor\fP, lets you interactively pseudocolor 
an image.
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5) Pixel Windowing / Pixel Thresholding
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The third subform, \fIWindow/Threshold\fP, allows you to threshold an image.
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CHANGE BANDS
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The \fICHANGE BANDS\fP option of the "Display Utilities" pull-down menu allows
you to \fIimmediately\fP change the band that is currently displayed.  When you
select the \fICHANGE BAND\fP option, a list widget will pop up, listing the
bands that are currently available in the VIFF file currently being used.
Selecting a band from the list widget will cause \fBviewimage\fP to immediately 
replace the currently displayed band with the new band.  NOTE: THIS OPTION
IS ONLY VALID WITH MULTI-BAND IMAGES!  Also note that the default option of
\fBviewimage\fP is to display the 1st band of the VIFF data provided.  If the 
VIFF data has only one image, that is considered the first band. 
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Colorspace Models 
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The interactive look up table, pseudocoloring, and thresholding operations 
offered by \fBviewimage\fP each work with any of 8 colorspace
models. It is very important that you fully understand these colormodels,
as well as the relationship between each of the colormodels, before the full
functionality of \fBviewimage\fP can be intelligently used.  These are the 
colorspace models that are available:
.RS
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RGB (Red, Green, Blue)
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CMY (Cyan, Magenta, Yellow)
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HSV (Hue, Saturation, Value)
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HLS (Hue, Lightness, Saturation)
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YIQ (Illuminance, Chrominances)
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CIE XYZ
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CIE UVW
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GREY 
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