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Learn: Calculating Image and Sound File Sizes
OCR GCSE J277 Computer Science specification
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Welcome!Today we'll learn how to calculate the file sizes of images and sound files. Understanding this helps us choose suitable storage devices and manage file sizes effectively.
Why Calculate File Sizes?Knowing how to calculate file sizes helps us estimate storage requirements and understand how different factors like resolution and sampling affect file size. This is important for managing space efficiently.
Image File Size FormulaTo calculate the size of an image file, use the formula: Image file size = colour depth × image height (px) × image width (px). Colour depth is the number of bits used to store each pixel's colour.
What does colour depth represent in an image file?
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Sound File Size FormulaTo calculate the size of a sound file, use the formula: Sound file size = sample rate × duration (s) × bit depth. Sample rate is the number of samples taken per second, and bit depth is the number of bits used for each sample.
The {{blank0}} rate is the number of samples taken per {{blank1}}.
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Factors Affecting File SizesFor images, resolution and colour depth determine file size. For sound files, sample rate, bit depth, and duration affect size. Higher values lead to better quality but larger files.
Which of the following increases an image file size?
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Examples of File Size CalculationsLet's explore examples to see these formulas in action. This will help you apply the calculations to real scenarios.
Match the items on the left with their correct pairs on the right
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Match the items on the left with their correct pairs on the right
Start the lesson to answer this math equation question
Review Time!Great work! You've learned how to calculate image and sound file sizes. Let's test your understanding with a few questions.
Which factors affect sound file size? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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Quick check: What happens if sound file duration doubles?
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Well Done!You've successfully completed the lesson on calculating image and sound file sizes. Keep practising to master these calculations!
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