What are color filters used for? what effects might different colors have (in photography)?

Filters are used for the modification of recorded images. In photography the usage of filter affects the colors brightness.

Explanation:

An accessory for camera is a Filter. They can be attached in the optical path. They are used in cinematography and photography.  They are used for the modification of the recorded images. They are helpful in making desired changes to the images taken.  The filters of different colors are used in monochrome photography.

They are used for the purpose of changing the brightness of the related colors. For instance a blue color pen can be rendered as any color ranging from white to black with different color filters.Filters are used for rendering the image in a desired way with desired changes and modifications.

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