Topic Test

• What is the smallest unit of an image that can be changed?

  Pixel
• How are pixels arranged in an image?

  In a rectangular grid
• What does each pixel in an image represent?

  One color
• How is each pixel stored in a digital image?

  As a series of binary digits
• What type of information can metadata include?

  File format, dimensions, resolution, color depth, GPS, date and time

  
• How many bits are required to store a pixel that can represent 256 different colors?

  8 bits
• If an image has a width of 1024 pixels and a height of 1536 pixels, what is its pixel count?

  1,572,864 pixels

  
• What is the relationship between image resolution and file size?

  Higher resolution leads to larger file sizes
• What are the characteristics of bitmap graphics?

  • Made up of a grid of pixels
  • Store detail about every individual pixel
  • Depend on resolution for quality
  • High resolutions lead to larger file sizes
  • Can be compressed but may lose quality
• What are typical bitmap file formats?

  BMP, GIF, JPEG, PNG, TIFF
• What are the advantages of vector-based graphics?

  • Do not depend on resolution for quality
  • Can be resized and edited without losing quality
  • Generally saved as smaller files than bitmaps
  • Used for 2D computer games and engineering drawings
• What is a typical vector file format?

  Scalable Vector Graphics (SVG)
• What is streaming in the context of video files?

  A process that allows a video to be viewed while it is downloading
• What happens during buffering while streaming a video?

  A part of memory stores a downloaded part of the video before it is watched
• What occurs if the buffer becomes close to empty during streaming?

  The video will stop and display a 'buffering' message
• What are the differences between bitmap and vector graphics?

  • Bitmap graphics are pixel-based; vector graphics are object-based
  • Bitmap graphics depend on resolution; vector graphics do not
  • Bitmap files are larger; vector files are generally smaller
  • Bitmap graphics can become pixelated when enlarged; vector graphics maintain quality