Returns the Red component of an (R,G,B) color.
Syntax
CLRRED(Color)
Input
Color | is a map or a column with the Color domain or a picture domain, or an expression which results in a color |
Domain type: | system domain Color or a Picture domain |
Output
CLRRED returns: | a value |
Domain: | system domain Image |
Note:
The CLRRED(Color) function is equivalent to MAPCOLORSEP(InMap, Red) operation.
Tips:
Usable in
Simple calculators, MapCalc, TabCalc
Examples
Pocket line calculator example:
? CLRRED(RPRCOLOR(Landuse,"Airport")) |
returns the red component of class "Airport" from representation Landuse, e.g. 255. |
TabCalc example:
Red = CLRRED(Color)
Landuse.rpr |
Landunit |
Colorname |
Color |
Red |
Agriculture |
Yellow |
(255, 255, 0) |
255 |
Airport |
Red |
(255, 0, 0) |
255 |
Bare soils |
Brown |
(164, 40, 40) |
164 |
Forest |
Forest Green |
(48, 128, 76) |
48 |
Grass |
Yellow Green |
(98, 98, 98) |
98 |
Lake |
Blue |
(0, 0, 255) |
0 |
Riverbed |
Cyan |
(0, 255, 255) |
0 |
Rocks |
Gray |
(128, 128, 128) |
128 |
Shrubs |
Magenta |
(255, 0, 255) |
255 |
MapCalc example:
LandColor = MAPCOLOR(Landuse)
Red = CLRRED(LandColor)
Landuse |
LandColor |
Red |
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See also:
COLOR | CLRGREEN | CLRYELLOW | CLRHUE |
MAPCOLOR | CLRBLUE | CLRMAGENTA | CLRSAT |
RPRCOLOR | CLRCYAN | CLRINTENS | |
CLRGREY | COLORHSI |