diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
index f7931fb7..035cc5ea 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
@@ -511,8 +511,10 @@ class UIDefaultsLoader
 			case "rgba":		return parseColorRgbOrRgba( true, params, resolver, reportError );
 			case "hsl":			return parseColorHslOrHsla( false, params );
 			case "hsla":		return parseColorHslOrHsla( true, params );
-			case "lighten":		return parseColorLightenOrDarken( true, params, resolver, reportError );
-			case "darken":		return parseColorLightenOrDarken( false, params, resolver, reportError );
+			case "lighten":		return parseColorHSLIncreaseDecrease( 2, true, params, resolver, reportError );
+			case "darken":		return parseColorHSLIncreaseDecrease( 2, false, params, resolver, reportError );
+			case "saturate":	return parseColorHSLIncreaseDecrease( 1, true, params, resolver, reportError );
+			case "desaturate":	return parseColorHSLIncreaseDecrease( 1, false, params, resolver, reportError );
 		}
 
 		throw new IllegalArgumentException( "unknown color function '" + value + "'" );
@@ -565,13 +567,14 @@ class UIDefaultsLoader
 	}
 
 	/**
-	 * Syntax: lighten(color,amount[,options]) or darken(color,amount[,options])
+	 * Syntax: lighten(color,amount[,options]) or darken(color,amount[,options]) or
+	 *         saturate(color,amount[,options]) or desaturate(color,amount[,options])
 	 *   - color: a color (e.g. #f00) or a color function
 	 *   - amount: percentage 0-100%
 	 *   - options: [relative] [autoInverse] [lazy] [derived]
 	 */
-	private static Object parseColorLightenOrDarken( boolean lighten, List<String> params,
-		Function<String, String> resolver, boolean reportError )
+	private static Object parseColorHSLIncreaseDecrease( int hslIndex, boolean increase,
+		List<String> params, Function<String, String> resolver, boolean reportError )
 	{
 		String colorStr = params.get( 0 );
 		int amount = parsePercentage( params.get( 1 ) );
@@ -588,9 +591,8 @@ class UIDefaultsLoader
 			derived = options.contains( "derived" );
 		}
 
-		ColorFunctions.ColorFunction function = lighten
-			? new ColorFunctions.Lighten( amount, relative, autoInverse )
-			: new ColorFunctions.Darken( amount, relative, autoInverse );
+		ColorFunctions.ColorFunction function = new ColorFunctions.HSLIncreaseDecrease(
+			hslIndex, increase, amount, relative, autoInverse );
 
 		if( derived ) {
 			ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java
index 00f60561..9f0592a7 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java
@@ -49,20 +49,26 @@ public class ColorFunctions
 		void apply( float[] hsl );
 	}
 
-	//---- class Lighten ------------------------------------------------------
+	//---- class HSLIncreaseDecrease ------------------------------------------
 
 	/**
-	 * Increase the lightness of a color in the HSL color space by an absolute
-	 * or relative amount.
+	 * Increase or decrease hue, saturation or luminance of a color in the HSL color space
+	 * by an absolute or relative amount.
 	 */
-	public static class Lighten
+	public static class HSLIncreaseDecrease
 		implements ColorFunction
 	{
-		private final float amount;
-		private final boolean relative;
-		private final boolean autoInverse;
+		public final int hslIndex;
+		public final boolean increase;
+		public final float amount;
+		public final boolean relative;
+		public final boolean autoInverse;
 
-		public Lighten( float amount, boolean relative, boolean autoInverse ) {
+		public HSLIncreaseDecrease( int hslIndex, boolean increase,
+			float amount, boolean relative, boolean autoInverse )
+		{
+			this.hslIndex = hslIndex;
+			this.increase = increase;
 			this.amount = amount;
 			this.relative = relative;
 			this.autoInverse = autoInverse;
@@ -70,33 +76,17 @@ public class ColorFunctions
 
 		@Override
 		public void apply( float[] hsl ) {
-			float amount2 = autoInverse && shouldInverse( hsl ) ? -amount : amount;
-			hsl[2] = clamp( relative
-				? (hsl[2] * ((100 + amount2) / 100))
-				: (hsl[2] + amount2) );
+			float amount2 = increase ? amount : -amount;
+			amount2 = autoInverse && shouldInverse( hsl ) ? -amount2 : amount2;
+			hsl[hslIndex] = clamp( relative
+				? (hsl[hslIndex] * ((100 + amount2) / 100))
+				: (hsl[hslIndex] + amount2) );
 		}
 
 		protected boolean shouldInverse( float[] hsl ) {
-			return hsl[2] >= 50;
-		}
-	}
-
-	//---- class Darken -------------------------------------------------------
-
-	/**
-	 * Decrease the lightness of a color in the HSL color space by an absolute
-	 * or relative amount.
-	 */
-	public static class Darken
-		extends Lighten
-	{
-		public Darken( float amount, boolean relative, boolean autoInverse ) {
-			super( -amount, relative, autoInverse );
-		}
-
-		@Override
-		protected boolean shouldInverse( float[] hsl ) {
-			return hsl[2] < 50;
+			return increase
+				? hsl[hslIndex] >= 50
+				: hsl[hslIndex] < 50;
 		}
 	}
 }