diff --git a/libraries/Camera/extras/CameraRawBytesVisualizer/CameraRawBytesVisualizer.pde b/libraries/Camera/extras/CameraRawBytesVisualizer/CameraRawBytesVisualizer.pde
index e8e098b13..673d066f4 100644
--- a/libraries/Camera/extras/CameraRawBytesVisualizer/CameraRawBytesVisualizer.pde
+++ b/libraries/Camera/extras/CameraRawBytesVisualizer/CameraRawBytesVisualizer.pde
@@ -17,7 +17,7 @@ final int cameraWidth = 320;
 final int cameraHeight = 240;
 
 // Must match the image mode in the Arduino sketch
-final boolean useGrayScale = true;
+boolean useGrayScale = true;
 
 // Must match the baud rate in the Arduino sketch
 final int baudRate = 115200;
@@ -120,3 +120,9 @@ void serialEvent(Serial myPort) {
   // and are ready for the next frame
   myPort.write(1);
 }
+
+void keyPressed() {
+  if (key == ' ') {
+    useGrayScale = !useGrayScale; // change boolean value of greyscale when space is pressed
+  }
+}
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