What Is a Yellow Filter and What Does It do in Photography?

A Yellow filter absorbs all coloured light except yellow. It is the most-popular colored filter used with black and white film. Because a yellow filter absorbs blue, it provides significantly greater contrast between blue and yellow or white subjects. The classic example of the use of a yellow filter is when shooting black and white scenes which include portions of a cloud filled sky. Use of a yellow filter in this situation significantly darkens the blue portions of the sky, whilst allowing the clouds to remain bright and vibrant. This change in contrast gives the sky a vastly improved sense of depth and drama.