White Balancing

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Why it's important to white balance a camera

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White Balancing

  1. 1. White Balancing Please download full version to activate animations
  2. 2. White Balancing
  3. 3. White Balance <ul><li>We see the world in many different tints of light </li></ul><ul><li>The problem is that our brains adjust what we see to filter out these tints, so we are often unaware that they exist at all... </li></ul>
  4. 4. White Balance <ul><li>Consider a summer’s day: </li></ul><ul><li>We might have a red dawn glow to begin with… </li></ul><ul><li>By noon, when the sun is high, we have bright yellow… </li></ul><ul><li>It might rain later, softening the light through grey clouds… </li></ul><ul><li>Before returning to a red sunset... </li></ul>
  5. 5. White Balance
  6. 6. White Balance <ul><li>Things get more complex when we add artificial lighting (light bulbs, etc...) into the mix: </li></ul>
  7. 7. White Balance
  8. 8. White Balance <ul><li>The reason that pictures have an orange tint with light bulbs and blue with fluorescent lights is because different lights have different colour temperatures </li></ul><ul><li>This is a huge topic – for now just accept that different lighting gives off different tints </li></ul>
  9. 9. Our Brains are Smart... <ul><li>And all the time our brain is ‘adjusting’ our perception of these changing tints: </li></ul>
  10. 10. ...Camcorders are Dumb <ul><li>Unfortunately a camcorder is not as clever as our brains </li></ul><ul><li>It has no idea what colour light it is filming in (despite advances in automatic sensors). This usually produces some pretty horrendous tints </li></ul>
  11. 11. Setting the White Balance <ul><li>Therefore you need to tell your camcorder what tint of light it is filming in </li></ul><ul><li>This is known as White Balancing </li></ul>
  12. 12. The Science Bit <ul><li>White Balance works on the fact that all colours can be produced from pure white light (think of Newton and his prisms): </li></ul>Pure White Light... ...can be split into a rainbow of colours (With apologies to Pink Floyd!)
  13. 13. What all this Means <ul><li>So if we tell a camcorder what white looks like in a given light, it can work out what every other colour should look like. This produces accurate colours, especially natural skin tones: </li></ul>
  14. 14. It’s not Difficult <ul><li>The Golden Rule: </li></ul><ul><li>White Balancing is dead easy to do and must be done at every new location </li></ul>
  15. 15. White Balancing a Camera <ul><li>Simply find the Manual White Balance control on your camcorder (but don’t press it yet). Then get somebody to hold up a sheet of white paper: </li></ul>Camcorder White Card
  16. 16. White Balancing a Camera <ul><li>Zoom in so that the white paper completely fills the screen: </li></ul><ul><li>...then press the Manual White Balance button - </li></ul>
  17. 17. ‘ I can’t find the WB button!’ <ul><li>The biggest problem you will face is finding the White Balance control </li></ul><ul><li>Every camcorder has a different way of setting the White Balance – some have buttons, some use an on-screen menu, and some set the WB at the moment they are switched on! Good Luck! </li></ul>
  18. 18. White Balancing

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