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Definition Of:

APL (Average Picture Level)

Film & Video DicitonaryFilm and Video Dicitonary
The video signal level, during the active picture part of each horizontal line, is mathematically averaged over the period of a frame to come up with APL. A 100 IRE Window pattern has a lower APL than a 100 IRE Flat Field pattern. Television program material is said to have a 15% average picture level over a long period of time. The Window patterns used for setting gray scale in all three titles have a 16% APL so that they will closely represent normal program material in their current drain on the high voltage power supply. The width of the Window was enlarged the extra 1% to accommodate the shape of the Philips PM5539 Color Analyzer which was on the market at the time of A Video Standard. That wide aspect ratio shape was passed on to Video Essentials. The computer world uses a much higher number for APL over time, that of 35%. That is reflected in the ANSI Checkerboard Patterns, VE T17 C27.


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A lens that adjus...A-Wind
A B Printing
A B Rolls
Above the Line
ACC (Automatic Co...Accent Light
Acetate Base
Action Cutting
Address Track
Adjustable lens o...
Aerial Shot
AES (Audio Engine...
AFC (Automatic Fr...AFM
AGC (Automatic Ga...Alarm Activated VCR
All video lines n...Ambient Light
Ambient noise
Amplitude Distort...Analog
Analog (Analogue)
Analog Recording
Anamorphic Video
Angle of View
ANSI (American Na...
Answer Print
Aperture Correction
APL (Average Pict...Apple Box
Aspect Ratio
Asperity Noise
Associate Producer
Associational Edi...Asynchronous Sound
ATSC (Advanced Te...ATTC (Advanced Te...Attenuate
Audible Spectrum
Audio S N Ratio
Automatic Picture...Automatic Slating...

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