Images

How bitmapped image is encoded

• A collection of pixels from an image is 'mapped' or diagrammed to specific memory locations holding their binary colour value

24-bit colour = true colour (i.e. 2^24 different colours) / monochrome = 1 bit, two colours ( black and white)

File size of bitmap in bits (exclusion of file header) = Colour depth * Resolution

How vector graphic is represented and encoded

• Images defined using mathematics and geometry such points, lines, curves and shapes. It allows for scability - objects and properties are stored mathematically

Bitmaps Vs Vector graphics

• Scaling images affect file size - scaling doesn't affect file size in vector graphics
• Distortion of pixels when scaling - vector graphic can scale without distortion
• Needs less power display

Uses of bitmapped image

• Capture scanned images from a paper doc - used by general computers as they're not big in size and it can be manipulated
• Scanning photograph

Uses of vector graphics

• General line-drawing diagrams
• Diagram for specialist applications (e.g. flowchart, topologies where specialist shapes library available)