diff --git a/cache.frag b/cache.frag
--- a/cache.frag
+++ b/cache.frag
@@ -31,7 +31,6 @@
 vec3 hsv2rgb(float h, float s, float v)
 {
   float i, f, p, q, t, r, g, b;
-  int ii;
   if (s == 0.0) {
     // Ignore hue
     r = v;
@@ -43,32 +42,17 @@
     h = pvp_adjust_3(h);
     h = h - floor(h);
     h = h * 6.0;
-    i = floor(h); ii = int(i);
+    i = floor(h);
     f = h - i;
     p = v*(1.0 - s);  // The "low-flat" curve
     q = v*(1.0 - (s*f));  // The "falling" curve
     t = v*(1.0 - (s*(1.0 - f)));  // The "rising" curve
-    switch(ii) {
-      case 0:  // red point
-        r = v; g = t; b = p; // RED max, GRN rising, BLU min
-        break;
-      case 1:  // yellow point
-        r = q; g = v; b = p; // RED falling, GRN max, BLU min
-        break;
-      case 2:  // green point
-        r = p; g = v; b = t; // RED min, GRN max, BLU rising
-        break;
-      case 3:  // cyan point
-        r = p; g = q; b = v; // RED min, GRN falling, BLU max
-        break;
-      case 4:  // blue point
-        r = t; g = p; b = v; // RED rising, GRN min, BLU max
-        break;
-      case 5:  // magenta point
-      default:
-        r = v; g = p; b = q; // RED max, GRN min, BLU falling
-        break;
-    }
+    if (i < 1.0) { r = v; g = t; b = p; } else
+    if (i < 2.0) { r = q; g = v; b = p; } else
+    if (i < 3.0) { r = p; g = v; b = t; } else
+    if (i < 4.0) { r = p; g = q; b = v; } else
+    if (i < 5.0) { r = t; g = p; b = v; } else
+                 { r = v; g = p; b = q; }
   }
   return vec3(r, g, b);
 }
@@ -78,5 +62,5 @@
   float h = n;
   float s = 1.0;
   float v = clamp(0.0, 1.0, 0.25 + log(h + 1.0));
-  gl_FragColor = vec4(hsv2rgb(frac(h), s, v), 1.0);
+  gl_FragColor = vec4(hsv2rgb(h, s, v), 1.0);
 }
diff --git a/colourize.frag b/colourize.frag
--- a/colourize.frag
+++ b/colourize.frag
@@ -36,7 +36,6 @@
 vec3 hsv2rgb(float h, float s, float v)
 {
   float i, f, p, q, t, r, g, b;
-  int ii;
   if (s == 0.0) {
     // Ignore hue
     r = v;
@@ -48,32 +47,17 @@
     h = pvp_adjust_3(h);
     h = h - floor(h);
     h = h * 6.0;
-    i = floor(h); ii = int(i);
+    i = floor(h);
     f = h - i;
     p = v*(1.0 - s);  // The "low-flat" curve
     q = v*(1.0 - (s*f));  // The "falling" curve
     t = v*(1.0 - (s*(1.0 - f)));  // The "rising" curve
-    switch(ii) {
-      case 0:  // red point
-        r = v; g = t; b = p; // RED max, GRN rising, BLU min
-        break;
-      case 1:  // yellow point
-        r = q; g = v; b = p; // RED falling, GRN max, BLU min
-        break;
-      case 2:  // green point
-        r = p; g = v; b = t; // RED min, GRN max, BLU rising
-        break;
-      case 3:  // cyan point
-        r = p; g = q; b = v; // RED min, GRN falling, BLU max
-        break;
-      case 4:  // blue point
-        r = t; g = p; b = v; // RED rising, GRN min, BLU max
-        break;
-      case 5:  // magenta point
-      default:
-        r = v; g = p; b = q; // RED max, GRN min, BLU falling
-        break;
-    }
+    if (i < 1.0) { r = v; g = t; b = p; } else
+    if (i < 2.0) { r = q; g = v; b = p; } else
+    if (i < 3.0) { r = p; g = v; b = t; } else
+    if (i < 4.0) { r = p; g = q; b = v; } else
+    if (i < 5.0) { r = t; g = p; b = v; } else
+                 { r = v; g = p; b = q; }
   }
   return vec3(r, g, b);
 }
@@ -87,8 +71,9 @@
     float h = hscale * log(i) + hshift;
     float s;
     float v;
-    if (t           > 0.0) { s = 0.55; } else { s = 0.45; }
-    if (frac(i / 2) < 0.5) { v = 0.95; } else { v = 1.00; }
+    if (t            > 0.0) { s = 0.55; } else { s = 0.45; }
+    i /= 2.0;
+    if (i - floor(i) < 0.5) { v = 0.95; } else { v = 1.00; }
     c.rgb = hsv2rgb(h, s, v);
     c.rgb *= clamp(0.5 + 0.25 * log(d), 0.0, 1.0);
   }
diff --git a/gruff.cabal b/gruff.cabal
--- a/gruff.cabal
+++ b/gruff.cabal
@@ -1,5 +1,5 @@
 Name:                gruff
-Version:             0.1
+Version:             0.1.1
 Synopsis:            fractal explorer GUI using the ruff library
 Description:
     Currently allows exploration only of the Mandelbrot Set fractal.