In some cases a more selective form of colour correction is needed after the Primary Correction and is applied to the corrected and recorded material. This Secondary Colour Correction is aimed at controlling a particular colour or narrow range of colours – such as those on a car or product. Here typically the hue, gain and saturation can be changed. There are also several methods available for defining the object or area of required colour correction such as using wipe-pattern shapes, drawing an electronic mask by hand or a combination of automatic and by-hand methods. Some of the most sophisticated tools are provided by media workstations such as Quantel’s eQ and iQ.