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INTRODUCTION TO PHOTOGRAPHY
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DEFINITION 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.
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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? Working Of Camera ≈ Human Vision Concept Both have: •Lens •Iris •Recording Medium
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FOCUS 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.
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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 motion. Cameras capture light by fast action of opening and closing of a shutter.
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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 semiconductor 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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