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Glossary pixels

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Pixels are the smallest addressable elements that make up digital images. They are arranged in a grid on imaging sensors and display screens. Each pixel can only represent one color at a time, but together they blend to create the illusion of a full color image. Color depth refers to the number of bits used per pixel to represent color, with more bits allowing for more possible colors. Common color depths include 1 bit (2 colors), 8 bits (256 colors), and 24 bits (over 16 million colors). Digital camera sensors use a grid of light-sensitive pixels that convert photons to electrons through the photoelectric effect. The captured data is then converted to digital information representing the color values of each pixel.

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BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video The term pixel is short for Picture element and pixels are the small dots that make up the images on digital. They are the smallest addressable element in a display device. Each pixel can only be one colour at a time, but because they are so small they tend to blend together from different shades and blends of colours . Pixels and Colour Colour Depth: this is defined by the number of bits per pixel that can be shown on a computer screen. Data is stored in bits each bit represents 2 colours as it has a value of either 0 or 1 and the more bits that there is per pixel the more colours that can be displayed. These are some examples of colour depth: Colour Depth Number of Colours 1 bit colour 2 4 bit colour 16 8 bit colour 256 24 bit colour True Colour: 16,777,216
Pixels and Colour BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video Colour Depth- since each bit represents 2 different colours, its quite simple to work out the number of colours for the various colour depths because the number of the colours it could be would be 2 to the power of the number of bits per pixel: Colour Depth of 4 bits would be 2 times itself 4 times: 2x2x2x2 = 16 colours Colour Depth of 8 bits would be 2 times itself 8 times: 2x2x2x2x2x2x2x2 = 256 colours Colour Depth of 24 bits would be 2 times itself 24 times: 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2 = 16,777,216 colours
BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video Digital Cameras dont have film instead they have a sensor and this sensor converts light into electrical charges. It takes the light and focuses it through the lens onto this sensor made out of silicon It is made up of a grid of tiny photosites and these photosites are sensitive to light. These photosites are usually referred to as pixels as it is a contraction of a picture element and there are millions of individual pixels in the sensor of a digital camera. Each pixel on the sensor absorbs photons and releases electrons through something that is called the Photoelectric Effect. This is where electrons are emitted from metals and non metallic solids liquids or gas as a consequence of their absorption of energy from electromagnetic radiation of short wavelength such as ultraviolet light for example.
BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video CCD - this stands for charge-coupled device and it is the image sensor that is used by most digital cameras but some camera use CMOS which is complementary metal oxide semiconductor technology instead and both of these image sensors convert light into electrons. Once the sensor converts the light into electrons it reads the value of each cell in the image. This electric charge is then transferred and converted to an analog voltage that is amplified and then sent to an analog digital converter where it is turned into a number - digitised.

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Glossary pixels

  • 1. BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video The term pixel is short for Picture element and pixels are the small dots that make up the images on digital. They are the smallest addressable element in a display device. Each pixel can only be one colour at a time, but because they are so small they tend to blend together from different shades and blends of colours . Pixels and Colour Colour Depth: this is defined by the number of bits per pixel that can be shown on a computer screen. Data is stored in bits each bit represents 2 colours as it has a value of either 0 or 1 and the more bits that there is per pixel the more colours that can be displayed. These are some examples of colour depth: Colour Depth Number of Colours 1 bit colour 2 4 bit colour 16 8 bit colour 256 24 bit colour True Colour: 16,777,216
  • 2. Pixels and Colour BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video Colour Depth- since each bit represents 2 different colours, its quite simple to work out the number of colours for the various colour depths because the number of the colours it could be would be 2 to the power of the number of bits per pixel: Colour Depth of 4 bits would be 2 times itself 4 times: 2x2x2x2 = 16 colours Colour Depth of 8 bits would be 2 times itself 8 times: 2x2x2x2x2x2x2x2 = 256 colours Colour Depth of 24 bits would be 2 times itself 24 times: 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2 = 16,777,216 colours
  • 3. BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video Digital Cameras dont have film instead they have a sensor and this sensor converts light into electrical charges. It takes the light and focuses it through the lens onto this sensor made out of silicon It is made up of a grid of tiny photosites and these photosites are sensitive to light. These photosites are usually referred to as pixels as it is a contraction of a picture element and there are millions of individual pixels in the sensor of a digital camera. Each pixel on the sensor absorbs photons and releases electrons through something that is called the Photoelectric Effect. This is where electrons are emitted from metals and non metallic solids liquids or gas as a consequence of their absorption of energy from electromagnetic radiation of short wavelength such as ultraviolet light for example.
  • 4. BTEC Level 3 Extended Diploma in Creative Media Production Unit 64: Motion Graphics and Compositing Video CCD - this stands for charge-coupled device and it is the image sensor that is used by most digital cameras but some camera use CMOS which is complementary metal oxide semiconductor technology instead and both of these image sensors convert light into electrons. Once the sensor converts the light into electrons it reads the value of each cell in the image. This electric charge is then transferred and converted to an analog voltage that is amplified and then sent to an analog digital converter where it is turned into a number - digitised.