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Representing Images (Pixels (Images are made up of picture elements or…
Representing Images
Pixels
Images are made up of picture elements or pixels
Pixels are tiny coloured squares
Each pixel has a binary representation
More pixels- higher resolution
Typical jpeg images- 24 bits store a pixel
Higher resolution- greater file size and better quality
Moving Images
Way of saving a video or movie
Movies made up of still images when put together appear to move
25 to 29 images per second- frames
File sizes- large
Download can take long time- usually streamed- kept smooth by buffering
Vectors and Bitmap
Vector-based graphics
Stores information about components that make up image
Objects- Lines, curves and shapes
Small file size- do not require much energy
Dont lose quality- many look cartoon
File formats- .svg .eps .xml
Based on mathematical equations
Bitmap images
Made of different coloured pixels
Large file size- computer stores details of every pixel
Images look real
Lose quality when resized
File formats- .bmp jbeg gif .png
Support the transfer of moving images
Streaming
Video can be viewed without delay
Can be watched on 'real time'
If wanted to watch again- needs to do the same again
Watch almost instantly
Large storage space
Used by Netflix, Youtube etc
Buffering
When video is downloading the segments need to be stored somewhere
Used to download next part of video
Buffer not filling- lower quality images