Image blur

[farshizzo]

I've attached a better version of the blur example that allows you to specify the blur kernel size. Previously it was 9. In the test script I have set it to 40. Surprisingly this didn't affect performance on my machine. A larger blur kernel will create more blur. Once you specify the blur kernel, you cannot change it. I recommend setting the blur kernel to the point where it matches your maximum desired blur. This way you can keep the blur scale under 1.0, which will prevent pixelization.