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package colors
import (
"fmt"
"math"
)
type CMYK struct {
C int // 0-100
M int // 0-100
Y int // 0-100
K int // 0-100
}
func (c CMYK) String() string {
return fmt.Sprintf("cmyk(%d%%, %d%%, %d%%, %d%%)", c.C, c.M, c.Y, c.K)
}
func (c CMYK) ToPrecise() PreciseColor {
return PreciseColor{
R: (1 - float64(c.C)/100) * (1 - float64(c.K)/100),
G: (1 - float64(c.M)/100) * (1 - float64(c.K)/100),
B: (1 - float64(c.Y)/100) * (1 - float64(c.K)/100),
}
}
func (c CMYK) FromPrecise(p PreciseColor) ColorSpace {
// Extract RGB components from the PreciseColor
r := p.R
g := p.G
b := p.B
// Calculate the K (key/black) component
k := 1 - math.Max(math.Max(r, g), b)
// Avoid division by zero when K is 1 (pure black)
if k == 1 {
return CMYK{C: 0, M: 0, Y: 0, K: 100}
}
// Calculate the CMY components based on the remaining color values
cyan := (1 - r - k) / (1 - k)
magenta := (1 - g - k) / (1 - k)
yellow := (1 - b - k) / (1 - k)
// Scale to 0-100 and return
return CMYK{
C: int(math.Round(cyan * 100)),
M: int(math.Round(magenta * 100)),
Y: int(math.Round(yellow * 100)),
K: int(math.Round(k * 100)),
}
}
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