Re­mov­ing a colour cast

Mac Format - - PHOTOGRAPHY -

When tak­ing a pic­ture, your iPhone or cam­era needs to make thou­sands of split sec­ond cal­cu­la­tions, one of which is to judge how the scene has been il­lu­mi­nated – by sun­light, cloudy skies, tung­sten bulbs, flu­o­res­cent tubes and so on – and take this into ac­count when bal­anc­ing the colours within the shot so the re­sult re­flects the orig­i­nal. If it gets it wrong, your im­age will have a blueish or yel­lowy tint, which you need to cor­rect in post pro­duc­tion.

When work­ing with raw files in Light­room, Aper­ture or Adobe Cam­era Raw, use the White Bal­ance menu to se­lect the orig­i­nal light source. These are de­scribed us­ing plain English terms, like cloudy, day­light, shade and so on. If you’re not work­ing with raw files you’ll have to use the Temp (or Tem­per­a­ture) slider in each ap­pli­ca­tion. This runs from blue at one end to yel­low at the other; drag it away from whichever colour is tar­nish­ing your im­age. If, for ex­am­ple, your pic­ture has a yel­low­ish-or­ange tint be­cause it was taken un­der in­can­des­cent light, drag it to­wards the blue, and vice versa in the case of an al­ter­na­tive sce­nario.

This slider also makes an ap­pear­ance in iPhoto, along with the eye­drop­per tool that lets you au­to­mate the process by click­ing on a neu­tral grey (one that’s nei­ther too hot or too cold) within the im­age. It will use this as a ref­er­ence point, iden­ti­fy­ing any yel­low or blue tint within the un­der­ly­ing colour and re­mov­ing that from the whole frame.

colo ur fi xed


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