Ch 8 · Representing Images · Theory
Topic 8 of 14 in Data Representation — How Computers Store Everything as Numbers — 2 lessons.
Bitmaps: A Grid of Pixels
A bitmap image is a grid of tiny squares called pixels. Each pixel stores a colour as a number. The more bits per pixel (the colour depth), the more colours are possible.
Resolution & File Size
Two things drive an image's size:
All topics in Theory Data-representation
- Why Computers Use Binary
- Counting in Binary
- Hexadecimal — Shorthand for Binary
- Binary Addition & Overflow
- Negative Numbers — Two's Complement
- Logical Binary Shifts
- Representing Text
- Representing Images
- Representing Sound
- Storage Units & Compression
- Floating-Point Numbers (A Level)
- More Number Representations
- File Organisation & Access (A Level)
- Check Your Understanding