diff --git a/webcam-capture/src/example/java/com/github/sarxos/webcam/CustomResolutionExample.java b/webcam-capture/src/example/java/com/github/sarxos/webcam/CustomResolutionExample.java
index 4d66e310..afc4c2f7 100644
--- a/webcam-capture/src/example/java/com/github/sarxos/webcam/CustomResolutionExample.java
+++ b/webcam-capture/src/example/java/com/github/sarxos/webcam/CustomResolutionExample.java
@@ -8,12 +8,19 @@ public class CustomResolutionExample {
 
 	public static void main(String[] args) {
 
+		/**
+		 * When you set custom resolutions you have to be sure that your webcam
+		 * device will handle them!
+		 */
+
+		//@formatter:off
 		Dimension[] nonStandardResolutions = new Dimension[] {
-		WebcamResolution.PAL.getSize(),
-		WebcamResolution.HD720.getSize(),
-		new Dimension(2000, 1000),
-		new Dimension(1000, 500),
+			WebcamResolution.PAL.getSize(),
+			WebcamResolution.HD720.getSize(),
+			new Dimension(2000, 1000),
+			new Dimension(1000, 500),
 		};
+		//@formatter:on
 
 		Webcam webcam = Webcam.getDefault();
 		webcam.setCustomViewSizes(nonStandardResolutions);
diff --git a/webcam-capture/src/example/java/com/github/sarxos/webcam/TakePictureDifferentSizeExample.java b/webcam-capture/src/example/java/com/github/sarxos/webcam/TakePictureDifferentSizeExample.java
index 2cad5c07..15fcf871 100644
--- a/webcam-capture/src/example/java/com/github/sarxos/webcam/TakePictureDifferentSizeExample.java
+++ b/webcam-capture/src/example/java/com/github/sarxos/webcam/TakePictureDifferentSizeExample.java
@@ -17,8 +17,8 @@ public class TakePictureDifferentSizeExample {
 
 	public static void main(String[] args) throws IOException {
 		Webcam webcam = Webcam.getDefault();
-		webcam.open();
 		webcam.setViewSize(new Dimension(1024, 768));
+		webcam.open();
 		ImageIO.write(webcam.getImage(), "PNG", new File("test.png"));
 		webcam.close();
 	}
diff --git a/webcam-capture/src/main/java/com/github/sarxos/webcam/Webcam.java b/webcam-capture/src/main/java/com/github/sarxos/webcam/Webcam.java
index 87c67318..a014dd96 100644
--- a/webcam-capture/src/main/java/com/github/sarxos/webcam/Webcam.java
+++ b/webcam-capture/src/main/java/com/github/sarxos/webcam/Webcam.java
@@ -232,7 +232,9 @@ public boolean isOpen() {
 	}
 
 	/**
-	 * @return Webcam view size (picture size) in pixels.
+	 * Get current webcam resolution in pixels.
+	 * 
+	 * @return Webcam resolution (picture size) in pixels.
 	 */
 	public synchronized Dimension getViewSize() {
 		return device.getSize();
@@ -277,7 +279,10 @@ public Dimension[] getCustomViewSizes() {
 	public synchronized void setViewSize(Dimension size) {
 
 		if (size == null) {
-			throw new IllegalArgumentException("View size cannot be null!");
+			throw new IllegalArgumentException("Resolution cannot be null!");
+		}
+		if (open) {
+			throw new IllegalStateException("Cannot change resolution when webcam is open, please close it first");
 		}
 
 		// check if dimension is valid
diff --git a/webcam-capture/src/main/java/com/github/sarxos/webcam/ds/buildin/WebcamDefaultDevice.java b/webcam-capture/src/main/java/com/github/sarxos/webcam/ds/buildin/WebcamDefaultDevice.java
index 4f6811ea..cfc26fe1 100644
--- a/webcam-capture/src/main/java/com/github/sarxos/webcam/ds/buildin/WebcamDefaultDevice.java
+++ b/webcam-capture/src/main/java/com/github/sarxos/webcam/ds/buildin/WebcamDefaultDevice.java
@@ -129,6 +129,9 @@ public Dimension getSize() {
 
 	@Override
 	public void setSize(Dimension size) {
+		if (open) {
+			throw new IllegalStateException("Cannot change resolution when webcam is open, please close it first");
+		}
 		this.size = size;
 	}