Images

Images

1. Bitmap Images

   • Made up of "Pixels"
     • "Pixel" is short for "Picture Element"
   • In a black and white image, black pixels are stored as 1's and white pixels are stored as 0's
   • In larger images, 1's and 0's are replaced with longer numbers that represent how much red, green and blue is required in each pixel
     • This is called "Colour Depth"
   • In a 256 colour palette, the image would require 1 byte of storage per pixel
   • The more information stored about the colour of each pixel, the larger the file will become

2. Vector Images

   • Vector images do not store data as pixels
     • Data is stored as a set of instructions for drawing a geometric shape
   • Unlike bitmaps, when zooming in, the quality of the image isn't lost
   • Less storage space is needed for vector images compared to bitmap images

3. Metadata

   • Data about data
     • Typical examples of data stored in metadata are image's width, height and colour depth
   • Key properties which are needed to display an image properly are stored as metadata
   • Metadata is needed to render an image correctly