Storing images
- Created by: Tomiwaq
- Created on: 15-05-19 18:57
View mindmap
- Storing images
- Pixels
- Most images are bitmap images
- Bitmap images are made up of pixels
- The colour for each pixel is represented by a binary code
- Black and white images only have 2 colours
- This means it is a 1-bit where 0 is white and 1 is black
- 2-bit images can have up to 4 colours
- By increasing the number of bits you can get a better range of colours
- Colour depth and resolution
- The higher the resolution, the more pixels in a certain area which means a better quality image
- The resolution is the density of pixels in an image
- Most devices use a 24-bit colour depth
- Total number of colours 2n
- The colour depth is the number of bits used for each pixel
- Resolution is measured in dots per inch
- Increasing the colour depth or resolution increases the file size
- Metadata
- Metadata is the information stored in an image file which helps the computer recreate the image on screen
- Includes: file format, height, width, colour depth and resolution
- Without metadata, devices wouldn't be able to display images
- Pixels
- Colour depth and resolution
- The higher the resolution, the more pixels in a certain area which means a better quality image
- The resolution is the density of pixels in an image
- Most devices use a 24-bit colour depth
- Total number of colours 2n
- The colour depth is the number of bits used for each pixel
- Resolution is measured in dots per inch
- Increasing the colour depth or resolution increases the file size
Comments
No comments have yet been made