253900
Description
Mind Map by mj.bloomfield, updated more than 1 year ago
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Created by mj.bloomfield
over 10 years ago
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Data Representation
- Binary Numbers
- Also known as base 2 numbers
- 1 is one 1.
- As you go further left the power times by 2, e.g. 101101 is 1+4+8+32=45.
- Also known as base 2 numbers
- Text
- Uses a code which represents each letter as a number, e.g. ASCII.
- e.g. in ASCII, an "A" is 65," B" is 66, "a" is 97, "b" is 98, and so forth.
- e.g. in ASCII, an "A" is 65," B" is 66, "a" is 97, "b" is 98, and so forth.
- Uses a code which represents each letter as a number, e.g. ASCII.
- Graphics
- Many pixels together create a graphical image on
the screen
- "Resolution" is number of pixels per row x number of
rows.
- e.g. 800 pixels per row and 600 rows=800x600
resoulution.
- e.g. 800 pixels per row and 600 rows=800x600
resoulution.
- Each pixel has two properties, position on screen and
colour.
- Metadata is data about data. Metadata about images
is things such as height, width, colour, etc.
- There are different colour depths available, with
some storing more information about the colours of
eaach pixel
- The larger the total number of colours, the larger the space required to
store each pixel.
- The larger the total number of colours, the larger the space required to
store each pixel.
- Images can be compressed to reduce
their size by changing the resolution.
- Many pixels together create a graphical image on
the screen
- Data is measured in bits and their larger
counterparts, which get 1024 times larger in the
order of: bit, byte, kilobyte, megabyte, gigabyte,
terabyte...
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