diff --git a/Bitmap/AppKit/Helpers.swift b/Bitmap/AppKit/Helpers.swift
index 92e5f8c..206efbf 100644
--- a/Bitmap/AppKit/Helpers.swift
+++ b/Bitmap/AppKit/Helpers.swift
@@ -12,7 +12,7 @@ extension Pixel {
 		self.init(red:   nsColor.redComponent,
 		          green: nsColor.greenComponent,
 		          blue:  nsColor.blueComponent,
-		          alpha: nsColor.alphaComponent)
+		          premultiplyingWithAlpha: nsColor.alphaComponent)
 	}
 	
 	public init(_ cgColor: CGColor) {
diff --git a/Bitmap/UIKit/Helpers.swift b/Bitmap/UIKit/Helpers.swift
index ff70a0b..68590eb 100644
--- a/Bitmap/UIKit/Helpers.swift
+++ b/Bitmap/UIKit/Helpers.swift
@@ -11,7 +11,7 @@ extension Pixel {
 	public init(_ uiColor: UIColor) {
 		var (r, g, b, a): (CGFloat, CGFloat, CGFloat, CGFloat) = (0, 0, 0, 0)
 		uiColor.getRed(&r, green: &g, blue: &b, alpha: &a)
-		self.init(red: r, green: g, blue: b, alpha: a)
+		self.init(red: r, green: g, blue: b, premultiplyingWithAlpha: a)
 	}
 	
 	public init(_ cgColor: CGColor) {