Exam-style question
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A bitmap image is 1,200 pixels wide and 900 pixels high with a colour depth of 24 bits. Calculate its storage requirement in bits, ignoring metadata. Show the calculation and explain the role of each value.
Model answer
What a good answer should say
- Size in pixels = 1,200 × 900 = 1,080,000 pixels.
- Storage requirement = size in pixels × colour depth = 1,080,000 × 24 = 25,920,000 bits.
Explanation
Why this works
The width and height are multiplied to find the total number of pixels. The colour depth gives the number of bits stored for each pixel.
Multiplying the total number of pixels by 24 gives the storage requirement. Metadata is ignored as requested.
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