diff --git a/main.go b/main.go
index 0a00c93..9717f32 100644
--- a/main.go
+++ b/main.go
@@ -284,45 +284,49 @@ func getUV(img image.Image) (vals []float64) {
 	return
 }
 
+func between[T cmp.Ordered](v, min, max T) bool {
+	return v >= min && v <= max
+}
+
 func getColor(v float64) string {
-	if v < 1.0 {
+	switch {
+	case between(v, 0, 1):
 		return "006300"
-	} else if v >= 1.0 && v <= 2.0 {
+	case between(v, 1, 2):
 		return "00a014"
-	} else if v >= 2.0 && v <= 3.0 {
+	case between(v, 2, 3):
 		return "81c600"
-	} else if v >= 3.0 && v <= 4.0 {
+	case between(v, 3, 4):
 		return "fff800"
-	} else if v >= 4.0 && v <= 5.0 {
+	case between(v, 4, 5):
 		return "ffd100"
-	} else if v >= 5.0 && v <= 6.0 {
+	case between(v, 5, 6):
 		return "ffa600"
-	} else if v >= 6.0 && v <= 7.0 {
+	case between(v, 6, 7):
 		return "ff7200"
-	} else if v >= 7.0 && v <= 8.0 {
+	case between(v, 7, 8):
 		return "ff4a00"
-	} else if v >= 8.0 && v <= 9.0 {
+	case between(v, 8, 9):
 		return "ff0000"
-	} else if v >= 9.0 && v <= 10.0 {
+	case between(v, 9, 10):
 		return "ff0078"
-	} else if v >= 10.0 {
+	case v >= 10:
 		return "a80080"
 	}
 	return "000000"
 }
 
+func colorIs(c color.RGBA, v uint8) bool {
+	return c.R == v && c.G == v && c.B == v
+}
+
 func isWhite(col color.Color) bool {
 	col = color.RGBAModel.Convert(col)
 	c, ok := col.(color.RGBA)
 	if !ok {
 		return false
 	}
-	if c.R == 255 &&
-		c.G == 255 &&
-		c.B == 255 {
-		return true
-	}
-	return false
+	return colorIs(c, 255)
 }
 
 func isBlack(col color.Color) bool {
@@ -331,12 +335,7 @@ func isBlack(col color.Color) bool {
 	if !ok {
 		return false
 	}
-	if c.R == 0 &&
-		c.G == 0 &&
-		c.B == 0 {
-		return true
-	}
-	return false
+	return colorIs(c, 0)
 }
 
 func isStop(col color.Color) bool {
@@ -345,14 +344,7 @@ func isStop(col color.Color) bool {
 	if !ok {
 		return false
 	}
-	if c.R == 241 &&
-		c.G == 241 &&
-		c.B == 241 {
-		return true
-	}
-	if c.R == 88 &&
-		c.G == 88 &&
-		c.B == 88 {
+	if colorIs(c, 241) || colorIs(c, 88) {
 		return true
 	}
 	return false
@@ -364,19 +356,7 @@ func isStart(col color.Color) bool {
 	if !ok {
 		return false
 	}
-	if c.R == 241 &&
-		c.G == 241 &&
-		c.B == 241 {
-		return true
-	}
-	if c.R == 214 &&
-		c.G == 214 &&
-		c.B == 214 {
-		return true
-	}
-	if c.R == 0 &&
-		c.G == 0 &&
-		c.B == 0 {
+	if colorIs(c, 241) || colorIs(c, 214) || colorIs(c, 0) {
 		return true
 	}
 	return false
@@ -389,6 +369,7 @@ func fatal(err error) {
 	}
 }
 
+// DefaultCity is Muenchen
 const DefaultCity = "24"
 
 var locations = map[string]string{