title: Fast "for each pixel in bitmap" loop
body: <p>I'm writing a Visual Basic application that takes a screenshot of the desktop and crops it down to a 200px by 200px image around the center of the screen. One part of the application would iterate through each pixel and check if the RGB of that pixel is a certain color (this is meant to take under a second for it to be efficient), and unfortunately Bitmap.Getpixel is not doing me any good whether or not It's being loaded into the memory via Bitmap.Lock or not.</p>
  
  <p>Is there a faster (almost instantaneous) way of doing so? Thanks.</p>