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Pixels powerpoint

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  • 1. Pixels A Pixel or pel in digital imaging is a physical point in a Rasta image In a display device its is the smallest addressable element The pixel address corresponds to its physical coordination Each pixel is a sample of an original image Each pixel intensity is variable
  • 2. Pixels Picture element is what the term pixel actually stands for. The way they make up the images on digital is by using all these little tinydots. A matrix of maybe millions of pixels is divided up on screen. Even though pixels can only make one colour at a time they often mixtogether to make various shades. The number of bits used to represent it will determine how many coloursa pixel can be,
  • 3. Colour and pixels The number of bits per pixel that can be displayed on a computer screen is whatdefines colour depthcolour depth No of colours1 bit colour 24 bit colour 168 bit colour 25624 bit colour true colour More colours can be displayed the more bits each pixel has The examples of this are shown above
  • 4. Cameras – converting light Digital cameras have a sensor that converts light into electric charges This is clearly about alternative then film
  • 5. Cameras – converting light Digital cameras a far more advanced then film They convert light into electrical charges via a sensor In the camera there is a sensor made out of silicon A digital camera using the lens takes light and puts it on to the sensor Each photo site on the sensor absorbs photons It also releases electrons trough the photoelectric effect Electrons are emitted from matter in the photo electric effect
  • 6. Cameras – converting light A charge coupled device is the image sensor deployed by most typicalcameras Some different cameras use alternative technology like complementarymetal oxide semiconductor They both are shortened down as ccd or cmos Ccd and cmos bothe convert light into electrons

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