cmyka
CMYK colors

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<cmyka> ( cyan magenta yellow black alpha -- cmyka )

Vocabulary
colors.cmyk

Class description
The class of CMYK (Cyan, Magenta, Yellow, Black) colors with an alpha channel. All slots store values in the interval [0,1].

Definition

IN: colors.cmyk

TUPLE: cmyka
    { cyan read-only } { magenta read-only }
    { yellow read-only } { black read-only } { alpha read-only }
    ;

Methods

USING: accessors colors.cmyk colors.gray combinators kernel math
math.order ;

M: cmyka >gray
    [
        {
            [ cyan>> 0.3 * ]
            [ magenta>> 0.59 * ]
            [ yellow>> 0.11 * ]
            [ black>> ]
        } cleave + + + 1.0 min 1.0 swap -
    ] [ alpha>> ] bi <gray> ;


USING: accessors colors colors.cmyk kernel math math.order ;

M: cmyka >rgba
    [ [ cyan>> ] [ black>> ] bi + ]
    [ [ magenta>> ] [ black>> ] bi + ]
    [ [ yellow>> ] [ black>> ] bi + ] tri
    [ 1.0 min 1.0 swap - ] tri@ 1.0 <rgba> ; inline