From d4a6d348f9939a6022a9f7c3724fb76ff4d20388 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Fri, 3 Mar 2017 18:43:30 -0500
Subject: [PATCH] ...

---
 MagickCore/enhance.c | 54 ++++++++------------------------------------
 1 file changed, 9 insertions(+), 45 deletions(-)

diff --git a/MagickCore/enhance.c b/MagickCore/enhance.c
index 1a0280d99..92d8d8729 100644
--- a/MagickCore/enhance.c
+++ b/MagickCore/enhance.c
@@ -2947,11 +2947,7 @@ static inline void ModulateHCL(const double percent_hue,
     Increase or decrease color luma, chroma, or hue.
   */
   ConvertRGBToHCL(*red,*green,*blue,&hue,&chroma,&luma);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue > 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   chroma*=0.01*percent_chroma;
   luma*=0.01*percent_luma;
   ConvertHCLToRGB(hue,chroma,luma,red,green,blue);
@@ -2970,11 +2966,7 @@ static inline void ModulateHCLp(const double percent_hue,
     Increase or decrease color luma, chroma, or hue.
   */
   ConvertRGBToHCLp(*red,*green,*blue,&hue,&chroma,&luma);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue > 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   chroma*=0.01*percent_chroma;
   luma*=0.01*percent_luma;
   ConvertHCLpToRGB(hue,chroma,luma,red,green,blue);
@@ -2993,11 +2985,7 @@ static inline void ModulateHSB(const double percent_hue,
     Increase or decrease color brightness, saturation, or hue.
   */
   ConvertRGBToHSB(*red,*green,*blue,&hue,&saturation,&brightness);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue > 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   saturation*=0.01*percent_saturation;
   brightness*=0.01*percent_brightness;
   ConvertHSBToRGB(hue,saturation,brightness,red,green,blue);
@@ -3016,11 +3004,7 @@ static inline void ModulateHSI(const double percent_hue,
     Increase or decrease color intensity, saturation, or hue.
   */
   ConvertRGBToHSI(*red,*green,*blue,&hue,&saturation,&intensity);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue > 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   saturation*=0.01*percent_saturation;
   intensity*=0.01*percent_intensity;
   ConvertHSIToRGB(hue,saturation,intensity,red,green,blue);
@@ -3039,11 +3023,7 @@ static inline void ModulateHSL(const double percent_hue,
     Increase or decrease color lightness, saturation, or hue.
   */
   ConvertRGBToHSL(*red,*green,*blue,&hue,&saturation,&lightness);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue >= 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   saturation*=0.01*percent_saturation;
   lightness*=0.01*percent_lightness;
   ConvertHSLToRGB(hue,saturation,lightness,red,green,blue);
@@ -3062,11 +3042,7 @@ static inline void ModulateHSV(const double percent_hue,
     Increase or decrease color value, saturation, or hue.
   */
   ConvertRGBToHSV(*red,*green,*blue,&hue,&saturation,&value);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue >= 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   saturation*=0.01*percent_saturation;
   value*=0.01*percent_value;
   ConvertHSVToRGB(hue,saturation,value,red,green,blue);
@@ -3085,11 +3061,7 @@ static inline void ModulateHWB(const double percent_hue,
     Increase or decrease color blackness, whiteness, or hue.
   */
   ConvertRGBToHWB(*red,*green,*blue,&hue,&whiteness,&blackness);
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue >= 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   blackness*=0.01*percent_blackness;
   whiteness*=0.01*percent_whiteness;
   ConvertHWBToRGB(hue,whiteness,blackness,red,green,blue);
@@ -3110,11 +3082,7 @@ static inline void ModulateLCHab(const double percent_luma,
   ConvertRGBToLCHab(*red,*green,*blue,&luma,&chroma,&hue);
   luma*=0.01*percent_luma;
   chroma*=0.01*percent_chroma;
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue >= 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   ConvertLCHabToRGB(luma,chroma,hue,red,green,blue);
 }
 
@@ -3133,11 +3101,7 @@ static inline void ModulateLCHuv(const double percent_luma,
   ConvertRGBToLCHuv(*red,*green,*blue,&luma,&chroma,&hue);
   luma*=0.01*percent_luma;
   chroma*=0.01*percent_chroma;
-  hue+=0.5*(0.01*percent_hue-1.0);
-  while (hue < 0.0)
-    hue+=1.0;
-  while (hue >= 1.0)
-    hue-=1.0;
+  hue+=fmod((percent_hue-100.0),200.0)/200.0;
   ConvertLCHuvToRGB(luma,chroma,hue,red,green,blue);
 }
 
-- 
2.40.0