swift - How to guarantee that an NSColor has enough saturation? -

i need guarantee color has enough saturation.

i made extension nscolor tests give me weird values: tempcolor seems have lots of saturation.

so function returns self?

where's mistake?

i've tried without converting nscalibratedrgbcolorspace didn't , input color can of different type anyway.

extension nscolor {     func withminimumsaturation(minimumsaturation: cgfloat) -> nscolor {         // color hue/rgb/other convert rgb         if var tempcolor = self.colorusingcolorspacename(nscalibratedrgbcolorspace) {             // prepare values             var hue: cgfloat = 0.0             var saturation: cgfloat = 0.0             var brightness: cgfloat = 0.0             var alpha: cgfloat = 0.0             // populate values             tempcolor.gethue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha)             // if color not enough saturated             if saturation < minimumsaturation {                 // return same color more saturation                 return nscolor(calibratedhue: hue, saturation: minimumsaturation, brightness: brightness, alpha: alpha)             }         }         // if detection fails, return same color         return self     } } 

usage:

let source = mycolorfromalistofcolors // nscolor let guaranteed = source.withminimumsaturation(0.15) 

edit: works. i've accepted aaron's answer because helped me understand situation (i comparing colors redcomponents , similar).

your method seems fine.

for colors low saturation, returns different color:

if increase minimum saturation 0.15 more significant, 0.45, change more significant:

so, method works expect would. i'm guessing need tweak 0.15 input results want.

it may log old , new saturations debugging:

if saturation < minimumsaturation {     // return same color more saturation     println("new saturation: \(minimumsaturation)")      return nscolor(calibratedhue: hue, saturation: minimumsaturation, brightness: brightness, alpha: alpha) } else {     println("discarding saturation: \(saturation)") }