Representing Images
Pixels
bitmap
Made up of a grid of pixels
Vector
click to edit
Storing every pixel, means a very large file size
Store details about every individual element (pixel) that makes up an image
It can also be compressed that reduces the file size
Store information about the components that make up an image
Components are based on mathematical objects such as lines, curves and shapes
Details are not stores as individuals pixels
Each path, line, shape can be edited separately to change shape, style and colour
click to edit
click to edit
Smaller files sizes the bitmap
Scalable images
The more pixels the better the quality/resolution of the image
although higher resolution = bigger file size.
They are sometimes referred to as picture elements.
click to edit
Pixels are ting squares that make up a picture
Moving Images
Is another way of saying Movie or Video
File sizes can be very large
There are usually 25 to 29 images/frames a second.
Movies are made up of still images that when put together appear move
Download is long but can be helped by buffering
Streaming
Video can be viewed without delay on a website
Can be watched on "real time"
Disadvantage = If you want to watch it again it has to be from the beginning
click to edit
Advantages = You can watch it almost instantly.
Buffering
When a video is downloading the segments need to be stored somewhere, this is called Buffering.
When a user is watching part of a video the buffer is used to download the next part of the video