Nested for loops

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Nested for loops
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Traversing each pixel

• we know how to get the image width and the image
  height, now we want to access each pixel
• (0, 0), (0, 1), (0, 2) ... (0, h - 1)
• (1, 0), (1, 1), (1, 2) ... (1, h - 1)
• (w - 1, 0) , (w - 1, 1) , (w - 1, 2) ... (w
  - 1, h - 1)

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Getting colour values

• the BufferedImage class provides us with a method
  named getRGB()
• this method returns the colour value of a pixel
  as a single integer
• however we want to access the red, green and blue
  value of each pixel
• but the BufferedImage class does not provide us
  with a method to do this
• Color class can rescue us this class provides
  us with methods to get the individual red, green
  and blue colour information
• these methods are called getRed(), getGreen() and
  getBlue()

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