From a37adc2a021facc1b9c7ea8e19d053f09d5c9cc9 Mon Sep 17 00:00:00 2001
From: Giovanni Harting <539@idlegandalf.com>
Date: Fri, 29 Jun 2018 09:59:48 +0200
Subject: [PATCH] fixed gamma correction formula

---
 main.go | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/main.go b/main.go
index a61a996..06dc782 100644
--- a/main.go
+++ b/main.go
@@ -35,7 +35,7 @@ type config struct {
 		Address  int
 		MinPulse uint16
 		MaxPulse uint16
-		Gamma float64
+		Gamma    float64
 	}
 }
 
@@ -46,8 +46,8 @@ type LedDaemon struct {
 }
 
 var log = logging.MustGetLogger("LedD")
-var ledDaemon* LedDaemon
-var pca9685* PCA9685
+var ledDaemon *LedDaemon
+var pca9685 *PCA9685
 var pwmMap map[int32]*Pwm
 var readConfig config
 
@@ -97,13 +97,14 @@ func (daemon *LedDaemon) receive() {
 							continue
 						}
 
-						v = int32(math.Min(math.Round(math.Pow(float64(v), readConfig.Pca9685.Gamma)), RESOLUTION))
+						vPerc := float64(v) / float64(RESOLUTION)
+						vPerc = math.Pow(vPerc, 1/readConfig.Pca9685.Gamma)
 
 						if pwm, ok := pwmMap[c]; ok {
-							pwm.setPercentage(float32(v) / RESOLUTION * 100)
+							pwm.setPercentage(float32(vPerc * 100))
 						} else {
 							pwmMap[c] = pca9685.NewPwm(int(c))
-							pwmMap[c].setPercentage(float32(v) / RESOLUTION * 100)
+							pwmMap[c].setPercentage(float32(vPerc * 100))
 						}
 					}
 				}