representing images

• what is a bitmap image?


  made up of pixels
• what is a pixel?

  smallest identifiable area of an image
• what is a colour depth?

  number of bits per pixel
• what is a image resolution?

  total number of pixels in an image
• advantages of increasing the colour depth/resolution?

  -needs less space to store

  -increased quality
• disadvantages increasing colour depth/resolution?

  reduced quality

  need for more storage
• what is bitmap file size?

  number of pixels x bits per pixel
• what is ASCII file size?

  number of characters x bits per character