Since the selection area was a fixed width, the result was that anything in this particular range of colour would be changed. You may then proceed to the hue width control to eliminate other items in the picture that share the same colour as the sky. There may be other colour values that result in undesired objects showing up in the image matte.
In this instance, the addition of a mask or window could be added allowing the qualification to be only applied in the specified area or, in this case, the specific apple. Many manufacturers have introduced tools within their applications to minimise this issue by softening the qualified matte area. For feature films, we are generally a little more conservative about applying secondary colour correction. As we did in our previous article, we….