This key facts covers Bitmap vs Vector Graphics within Images & Sound for GCSE Computer Science. Revise Images & Sound in 3.3 Data Representation for GCSE Computer Science with 18 exam-style questions and 16 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 6 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Bitmap vs Vector Graphics
| Aspect | Bitmap (Raster) | Vector |
|---|---|---|
| Storage | Grid of pixels with color values | Mathematical formulas (lines, curves, shapes) |
| Scaling | Pixelated when enlarged | Perfect at any size (resolution-independent) |
| File Size | Large - depends on resolution | Small - just stores formulas |
| Best For | Photos, realistic images, complex scenes | Logos, diagrams, fonts, illustrations |
| Examples | JPEG, PNG, BMP, GIF | SVG, PDF, AI, EPS |
| Editing | Pixel-by-pixel (Photoshop) | Move/resize shapes (Illustrator) |
Practice questions for Images & Sound
What does colour depth refer to in a digital image?
Explain the effect of increasing colour depth on a digital image. Refer to both file size and image quality in your answer.