How does a black and white filter influence photo perception? When using film, B&W filters change contrast.
B&W filters for film come various colors, each affecting the contrast in various ways. Yellow creates a normal looking contrast. Without a filter, blue skies will be white, but with a yellow filter, the sky will be a light gray. Green will cause green objects to be recorded as very light gray, while red objects will be recorded as a dark gray.
For this reason, green filters are a good choice for portrait photography but not if the person has acne. Acne is red, and a green filter will just enhance it instead of hiding it. Orange and Red: These are high-constrast filters typically used in landscapes. They will lighten orange/red objects, but will darken blue objects.
This is how Ansel Adams was able to get those jet-black skies. Basically, the filter will lighten objects of a similar color and darken those objects that are of an opposite color. Because color has been ***ed, the viewer will notice forms, lines and shapes more so than had the image been in color.
Not every image is better in B&W, but if you want to stress the shape or form of the elements within the image, or if color is distracting from your message, then B&W is the way to go.
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