KwickClips Computer Systems · 40 sec · free
What do you divide bits by to get bytes?
Short answer. 8.
What do you divide bytes by to get KiB?
1024.
File size formulas
| File | Bits |
|---|---|
| Image | W x H x depth |
| Sound | Hz x bits x s |
Remember
| Divide by 8 for bytes |
| Then by 1024 for KiB |
Can you find a file size with one line of maths? Yes. Image bits are width times height times colour depth. Sound bits are rate times resolution times seconds. Remember. Divide by eight for bytes. Then by ten twenty four.
This clip is from the full lesson: Representing Images and Sound, and Calculating File Size — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Edexcel GCSE GCSE Computer Science (1CP2)
More KwickClips from this lesson
How many colours do 8 bits give?43 sec
What is sampling rate measured in?42 sec
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