Before using the definition described here, you should evaluate the form:
(require "color-defmodel")
The macro define-color-models can be used to define new color models for use in the color system.
The default color models are defined by the following form:
(define-color-models ((:rgb (red 0.0 1.0) (green 0.0 1.0) (blue 0.0 1.0)) (:hsv (hue 0.0 5.99999) (saturation 0.0 1.0) (value 0.0 1.0)) (:gray (level 0.0 1.0))))
For example, to define a new color model YMC and keep the existing RGB, HSV and GRAY models:
(define-color-models ((:rgb (red 0.0 1.0) (green 0.0 1.0) (blue 0.0 1.0)) (:hsv (hue 0.0 5.99999) (saturation 0.0 1.0) (value 0.0 1.0)) (:gray (level 0.0 1.0)) (:ymc (yellow 0.0 1.0) (magenta 0.0 1.0) (cyan 0.0 1.0))))
You must then define some functions to convert YMC color-specs to other color-specs. In this example, those functions are named:
make-ymc-from-rgb make-ymc-from-hsv make-ymc-from-gray
and:
make-rgb-from-ymc make-hsv-from-ymc make-gray-from-ymc
You can make this easier, of course, by defining the functions:
make-ymc-from-hsv make-ymc-from-gray make-hsv-from-ymc make-gray-from-ymc
in terms of make-ymc-from-rgb
and make-rgb-from-ymc
.
If you never convert between YMC and any other model, you need only define the function make-rgb-from-ymc
.
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:32:39