diff --git a/examples/brightness-contrast.js b/examples/brightness-contrast.js
index e6dac0eac7..c5726f3cca 100644
--- a/examples/brightness-contrast.js
+++ b/examples/brightness-contrast.js
@@ -29,7 +29,7 @@ function setResetBrightnessButtonHTML() {
 setResetBrightnessButtonHTML();
 
 increaseBrightness.addEventListener('click', function() {
-  layer.setBrightness(layer.getBrightness() + 0.125);
+  layer.setBrightness(Math.min(layer.getBrightness() + 0.125, 1));
   setResetBrightnessButtonHTML();
 }, false);
 resetBrightness.addEventListener('click', function() {
@@ -37,7 +37,7 @@ resetBrightness.addEventListener('click', function() {
   setResetBrightnessButtonHTML();
 }, false);
 decreaseBrightness.addEventListener('click', function() {
-  layer.setBrightness(layer.getBrightness() - 0.125);
+  layer.setBrightness(Math.max(layer.getBrightness() - 0.125, -1));
   setResetBrightnessButtonHTML();
 }, false);
 
@@ -59,6 +59,6 @@ resetContrast.addEventListener('click', function() {
   setResetContrastButtonHTML();
 }, false);
 decreaseContrast.addEventListener('click', function() {
-  layer.setContrast(layer.getContrast() - 0.125);
+  layer.setContrast(Math.max(layer.getContrast() - 0.125, 0));
   setResetContrastButtonHTML();
 }, false);
diff --git a/examples/hue-saturation.js b/examples/hue-saturation.js
index 53049a4336..a2aba69fa1 100644
--- a/examples/hue-saturation.js
+++ b/examples/hue-saturation.js
@@ -63,6 +63,6 @@ resetSaturation.addEventListener('click', function() {
   setResetSaturationButtonHTML();
 }, false);
 decreaseSaturation.addEventListener('click', function() {
-  layer.setSaturation(layer.getSaturation() - 0.25);
+  layer.setSaturation(Math.max(layer.getSaturation() - 0.25, 0));
   setResetSaturationButtonHTML();
 }, false);