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INTRODUCTION TO PHOTOGRAPHY

DEFINITION

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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 to photo.

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

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HOW IS PHOTO / LIGHT CAPTURED ON CAMERA?

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Both have: •Lens•Iris•Recording Medium

Working Of Camera ≈ Human Vision Concept

FOCUS

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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 Lenses.

TIME OF EXPOSURE

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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 motion.

Cameras capture light by fast action of opening and closing of a shutter.

PHOTOGRAPHIC PROCESS

• Film Photographic Process can be broadly divided into 3 major steps:• Ray optics and How light forms images• Film Processing• Print Processing

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EARLIER CAMERA TYPES

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CURRENTLY USED CAMERAS

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DIGITAL CAMERAS

• The digital camera perhaps the most remarkable instances of shift from Analog to Digital era. Conventional cameras depended entirely on chemical & mechanical processes. On other hand, digital cameras work on the mechanism of recording images electronically.

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DIGITAL CAMERAS

• 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

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