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Computer Science teaching and support

Representing Data


Welcome to the year 8 Computing unit of work where we look at how data is stored in a computer. Please use this page for further information and support on this unit of wo

intention
INTENTION

The intention of this unit is to provide an introduction to the fundamentals of how computers store, hold and use data.

implementation
IMPLEMENTATION

Students create a student portfolio of images, data, sound and text and how these are represented in binary.

impact
IMPACT

The impact of this unit will be measured by the end of unit assessment and the student portfolio.

Image information

Lossy Compression
Lossy image compression is a technique that reduces file size by discarding some data. This process compromises image quality to varying degrees, resulting in a smaller file size but potentially sacrificing details, especially when repeatedly compressed. JPEG is a widely used lossy compression format for images in digital media.
Lossless Compression

Lossless image compression is a method to reduce file size without compromising image quality. It achieves this by encoding data more efficiently, ensuring that the original image's detail and accuracy remain intact. Popular formats like PNG and GIF use lossless compression, making them ideal for preserving image fidelity in various applications.
JPEG
wiki

  • Join Photographic Experts Group

  • Lossy Compression

  • Created in 1992

  • Common format for photos

GIF
wiki

  • Graphics Interchange Format

  • Lossless Compression

  • Created in 1987

  • Supports 8 bits per pixel

PNG
wiki

  • Portable Network Graphics

  • Lossless Compression

  • Created in 1997

  • Supports 24bit RGB colour

BMP
wiki

  • Raster graphics image file

  • Created by Microsoft

  • Called Bitmap

TIFF
wiki

  • Tag Image File Format

  • Stored raster format files

  • Latest version created in 1992

  • A complex format

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programmer
Computer Programmer

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graphics
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