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Pseudo provides a method of altering the image's colormap. 
This tool allows the user to select single colors or ranges of colors from the 
colormap, or directly from the image, and alter those particular mappings. 
The upper portion of the psuedo color window contains a pallet,  
which is a block of pixel color boxes that are arranged in the 
order that they appear in the image's colormap.  The upper leftmost pixel 
box is the first color in the colormap and lower rightmost pixel box 
is the last color in the colormap.  When a range of colors from the pallet 
is chosen for altering, all colors that sequentially lie between those 
two colors in the colormap are also altered.  
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The two larger boxes in the upper left hand corner of the pseudo color
window are selection boxes, which show the first and
last pixel colors of the selected color range.  If only one 
color has been selected, the two boxes will display the same color.
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The three color bars below the pallet contain the three values of the selected 
pixel; the values of the selected pixel will depend on the colorspace model
which is currently chosen. It is these scroll bars that are used for altering 
the colormap.  For instance, if RGB is the current colorspace model, the 
scroll bars will represent the red, green, and blue values.  They will be
labeled "R", "G", and "B", and will appear in red, green, and blue, 
respectively.
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Colorspace Models
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The Pseudo Color function may use any one of eight color systems available with
Editimage: RGB, CMY, HSV, HSL, YIQ, XYZ, UVW, or GREY.  One can change the 
current colorspace model that is used with the Pseudo function by clicking on
the desired colorspace model.  The scroll bars which correspond
to the coordinates of the chosen color system will update immediately when
the colorspace model is changed. For a detailed explanation of each colorspace
model, see the section on "Colorspaces".
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Selecting A Range
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Single colors or ranges of colors can be selected in two ways for interactive 
colormap changes. First of all, selection can be accomplished via the 
pallet by placing the mouse cursor on the first color in the desired 
range and clicking, and then placing it on the last color in the range and 
clicking again.  The two selection boxes in the upper lefthand corner show the 
colors that have been selected.  The second way of selecting a range of
colors is to place the cursor in the image window and perform the same process 
as was described above.  The only colors that will be altered are those that lie
between the two colors in the selection boxes.
Selecting a single color for colormap manipulation is identical to selecting
a range of colors - just click twice while the cursor is positioned in the same position.
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Changing the Colormap
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After a color or a range of colors has been selected, the color map can
be changed using the color bars.  To the right of the color bars are the 
three values that create the color shown in the leftmost selection box.
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There are four ways to change the colormap.
.IP 1.
Click the left mouse button in a color bar.  This will increase the 
value of that color by 4 units.
.IP 2.
Click the right mouse button in a color bar.  This will decrease 
the value of that color by 4 units.
.IP 3.
Depress the center mouse button in a color bar and drag
the cursor left or right, until the correct color value is obtained, then
release the mouse button.  
.IP 4.
Place the cursor at the desired point along a color bar and click
the center mouse button.  This will set the color to the value which 
corresponds to the cursor's position on the color bar.
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Undoing Changes
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To undo a color change, simply select the "Undo" button on the bottom of 
the pseudo color window and the most recent color change will be reversed.  
Color changes are kept in a stack, so all color changes can be reversed
by repeatedly selecting "Undo".
Warning:  Since all colormap operations are tied together, 
"Undo" will also reverse color changes made using "LUT" or 
"Windowing/Thresholding".
