Filter: In lighting, a colored gel placed in front of a light source. In cinematography or videography, an optical device (colored, polarized, etc.) Attached to the lens.

 

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Filter: Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiation of certain frequencies while passing others. Electronically, filters can be . . . View Full Definition

Gelatin Filters: Filters cut from dyed gelatin sheets and held in front of the lens or studio light.

Graduated Filter: Filter with a colored section, which gradually reduces in density toward the center of the filter. The rest of the filter is clear. Also referred to as a graduated filter

Machine-Learning Filters: Filters run by machines that determine whether to block email based on algorithms that point to whether the message is likely spam.

Spam Filter: Systems that watch for spam and block it before it can hit the inbox. Spam filters can be complaint or content based.

Filters: Filters automatically move incoming emails into separate folders according to criteria that you specify. These criteria may be based on who the email is from, the priority, the subject, the . . . View Full Definition

Automatic Filter-Drip Coffee Makers: Coffee brewers that automatically heat and measure water into a filter and filter receptacle containing the ground coffee.

Content Filters: Software filters that block email based on words, phrases, or header information within the email itself. The goal is to identify spam and filter to the Bulk or Junk mail folders, although t . . . View Full Definition

Contrast Filters: Filters used in black and white photography to darken or lighten the films rendition of particular colors in the subject.

Correction Filter: Filter which alters the color rendition of a scene to suit the color response of the eye.