Working of a camera is based on the concept of human vision itself. If you have noticed just like your eye all cameras would have a lens, an iris (called aperture in cameras) and a recording material.
Nearly all forms of photography are based on the fact that certain chemicals are photosensitive—that is, they change in some way when exposed to light. Photosensitive materials abound in nature; plants that close their blooms at night are one example. The films used in photography depend on a limited number of chemical compounds that darken when exposed to light. The photographic process can be broadly divided into 3 major steps: Ray optics and how light is captured on film Film Processing Print Processing
Process of recording pictures by means of
capturing light on a light-sensitive medium, such
as a film or electronic sensor during a timed
exposure. The process is done through
mechanical, chemical or digital devices known
as cameras. The product of photography has
been called a photograph, commonly shortened
IMPORTANCE OF LIGHT
• The word "photography" comes from French word
photographie which is based on the Greek φώς
(phos) "light" + γραφή (graphê) "stylus", "paintbrush"
or "representation by means of lines" or "drawing",
together meaning "Drawing With Light.“
• LIGHT – Raw Material of SIGHT
HOW IS PHOTO / LIGHT CAPTURED
Working Of Camera ≈ Human Vision Concept
Just like a camera, our eyes also need
to focus. Ever tried this exercise?
inside our eyes This process is
performed by the lens tissues.
In cameras this is done by Optical
TIME OF EXPOSURE
Most of us have this belief that our
eyes see continuous motion. NO! This is
Untrue. Eyes capture only a frame at a
time just like a photograph. But when we
see successive frames, we perceive
Cameras capture light by fast action of
opening and closing of a shutter.
• Film Photographic Process can be broadly divided
into 3 major steps:
• Ray optics and How light forms images
• Film Processing
• Print Processing
• The digital camera perhaps the
most remarkable instances of
shift from Analog to Digital era.
depended entirely on chemical
& mechanical processes. On
other hand, digital cameras
work on the mechanism of
• In Digital photography, lens flashes the image on a sensor
instead of a Film. This sensor (CCD) which is made of semi-
conductor material captures image as a long string of 1s & 0s
that represent all tiny colored dots / pixels.
• We’ll be discussing this in detail in forthcoming sessions