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GETTING ACQUAINTED
CHANGING HLS VALUES
Colors are defined by a mixture of
hue
,
lightness,
and
saturation
(HLS) values
.
(Refer to the
Tektronix Color Standard
in Appendix G for an illustration of the HLS
color coordinate system .) This part of the exercise will show you how to change a
color by changing its HLS values
.
Because you are still in the Set Color function
,
the crosshairs and banner are
already displayed on the screen
.
If you weren 't already in the Set Color function
,
you would simply press the Menu key followed by F1
,
which would display the
banner and crosshairs.
Continue by selecting an item on the screen
:
Move the crosshair cursor to the blue square
.
Look at the banner at the bottom of the screen (Figure 2-9). The small blue square
shows the color the cursor is on
,
and the label tells you the color is Index 4
.
Figure 2-9
.
Identifying Current Colors
.
The rest of the banner tells you what the function keys
do.
Since the term inal
defines each color in terms of HLS values
,
you can change a color by changing
these
values.
The boxes labeled
hue
,
lightness
,
and
saturation
show the values for
the color the cursor is on
.
The labels
Ft, F2
,
and
F3
above the boxes indicate which
key to press to change each value
.
2-24
NOTE
The displays for this exercise were prepared using
a
4109
Terminal.
Because the 4109 can display
a
wider range of color, the HLS values
for
a
4106 or 4107 are different than those for the
4109.
We 've included
the values for the 4106 and 4107 as well
as
those we used on the
4109.
4106/4107/4109 OPERATORS
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