FILM AND VIDEO VARSHINI

YOGAESWARAN

The word Analog or Analogue recording comes from the Greek, ana “according to” and logos “relationship”.

An analogue signal is any constant/continuous sign for which the time differing feature (variable) of the sign is a representation of some other time changing quantity, i.e., analogues to another time

shifting signal. For instance, in an analogue audio signal the quick voltage of the signal shifts continuously with the pressure of the sound waves. It contrasts from a digital signal, in which the continuous quantity is a representation of a sequence of discrete qualities which can just go up

against one of a limited number of values. The term analogue signal typically alludes to electrical signals; be that as it may, mechanical, pneumatic, hydraulic, human speech, and different systems

may likewise pass on or be viewed as analogue signals.

• Analogue recording is a technique utilized for the recording of analogue signs which, among numerous conceivable outcomes, permits analogue audio and analogue video for later playback. • Analog recording techniques store signals as a continuous signal

in or on the media. The signal might be put away as a physical texture on a phonograph record, or a change in the field strength of a magnetic recording. This is unique from digital recording which digital signals are spoken to as discrete numbers.

DIGITAL SIGNALS •Digital signals are a sequence of pulses comprising of only two states which are ON (1) or OFF (0). There are no numbers or values in between. • Film can be a "chemical" or digital procedure. •When it is a chemical procedure a light sensitive silver halide emulsion covered on a film base is exposed to light in a camera. This makes a latended picture which is made visible by rising the film into a chemical mixture which we allude to as a ‘developer’. A print can then be made by projecting the picture from the film onto sensitized photographic paper and processing the paper through various chemical baths.

• A motion picture projector is an opto-mechanical gadget for showing motion picture film by projecting it onto a screen.

• Digital imaging does not necessitate chemicals. Digital pictures are caught utilizing varieties of photo sensors and these pictures are then handled by specialised programming. Prints can be made through for customary projection. On the other hand the film can stay in a digital form for digital projection.

• In regular talk individuals normally allude to chemical photography as analogue to contrast it with the digital procedure. Here, analogue is alluding a sign whose output is relative to the input.

• A great example for analogue in traditional photography is a light meter where light falls on a photograph cell which produces an

electrical current moving a needle over a scale. The brighter the light is the more the needle moves. Oddly, the sensor in a digital camera is likewise analogue: every one of the millions of pixels

which constitute the sensor is a light sensitive photo cells creating little electrical currents which is reacting to light. The

brighter the light the more strongly the current.

Film Chemistry: "The Alchemist In Hollywood" 1940 ACS American Chemical Society (VIDEO)