Graphics Programs Reference
In-Depth Information
Red Green Blue Colour
0
0
0
Black
1
1
1
White
1
0
0
Red
0
1
0
Green
0
0
1
Blue
1
1
0
Yellow
1
0
1
Magenta
0
1
1
yan
.5
.5
.5
Gray
.5
0
0
Dark red
1
.62
.4
Dark orange
.49
1
.83 Aquamarine
.95
.9
.8
Parchment
Yellow, for example, consists of the combination of the full intensities
of red and green, with no blue, while gray is the combination of 50%
intensities of red, green, and blue.
You can create your own colour maps or use any of matlab's many
predefined colour maps:
hsv
hot
gray
bone
copper pink
white flag
lines
colorcube jet
prism
cool
autumn spring winter
summer
Two nonstandard colour maps that are supplied in the companion soft-
ware include
redblue
and
myjet
. The first consists of red blending to
blue through shades of gray. The second consists of a modification of
the
jet
colour map that has white at the top instead of dark red.
These functions all take an optional parameter that specifies the num-
ber of rows (colours) in the colour map matrix. For example, typing
gray(8)
creates an 8
×
3 matrix of various levels of gray:
>> gray(8)
ans =
0
0
0
0.1429
0.1429
0.1429
0.2857
0.2857
0.2857
0.4286
0.4286
0.4286
0.5714
0.5714
0.5714
0.7143
0.7143
0.7143
0.8571
0.8571
0.8571
1.0000
1.0000
1.0000
To tell matlab to use a colour map, type it as an input to the
colormap
function:
