Returns a color specification in the red-green-blue model.
color
make-rgb red green blue &optional alpha => color-spec
red⇩ |
A red component. |
green⇩ |
A green component. |
blue⇩ |
A blue component. |
alpha⇩ |
A number between 0 and 1, or nil . |
color-spec |
A color specification. |
The function make-rgb
returns a color-spec in the :rgb
model with components red, green and blue.
Note that short floats are used for each component; this results in the most efficient color conversion process. However, any floating point number type can be used.
alpha indicates the alpha value of the color. 0 means it is transparent, 1 means it is solid. If alpha is nil
or not specified then the color does not have an alpha component and it is assumed to be solid.
The object returned by the following call defines the color red in the RGB model:
CL-USER 25 > (color:make-rgb 1.0s0 0.0s0 0.0s0) #(:RGB 1.0S0 0.0S0 0.0S0)
make-hsv
make-gray
color-model
color-blue
color-level
color-alpha
15.1 Color specs
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:33:10