Data Representation In Images

Data Representation In Images

1. BITMAPS

   • Store each pixel mapped onto the Memory
   • When Scaled Up Look very Pixelated
   • Take up large amounts of Memory
     • Memory Used by an Image
       • =
         • Width * Height * Colour Selection (Memory Used per pixel to declare what colour it is)
     • As use the Colour selection worth of memory per pixel, even when not needed at all
       • Other Formats that use pixel data, commonly use a form of compression to try and save memory space
   • File Suffix: .bmp
   • Can be considered the most basic method of saving a picture

2. VECTORS

   • Don't Pixelate after being scaled
   • Store each shape/line as data with relative coordinates, size e.c.t
     • Storing Shapes/Lines
       • Square
         • Centre relative coordinate
         • Size
         • Data for the lines
         • Fill colour
       • Lines
         • Width
         • Colour
         • If not from another shape
           • Start Relative Coordinates
           • End Relative Coordinates
       • Circle
         • Centre Relative Coordinates
         • Radius
         • Data for the line

3. Commonly used amounts of data for saving colours

   • RGB
     • 3Byte / 24Bit
       • 16777216 Colours
   • RGBA
     • 4Byte/ 32Bit
       • 4294967296 Colours
   • But other amounts can be used, even as low as 2bit

4. METADATA

   • DATA about the DATA
   • In Bitmaps (And other image Types)
     • Stores
       • WIDTH
       • HEIGHT
       • COLOUR RANGE
       • Additional Tag DATA
         • Author
         • Date Created