ITPEC IP October 2024 Question 25
Which of the following is the unit that represents the resolution when a photograph or a picture is read by a scanner?
Explanation
dpi — the unit for the resolution at which a scanner reads an image.
dpi means dots per inch: the number of dots the scanner samples along one inch of the original. The higher the dpi, the finer the detail captured and the larger the image data. Printer resolution uses the same unit.
Answer (a)
Why not others:
- •(b) fps — frames per second, the frame rate of video, not spatial resolution
- •(c) pixel — a single picture element; it counts dots but is not a density per unit of length
- •(d) ppm — pages per minute, the speed of a printer or scanner, not its resolution
Key rule: Resolution as a density is dots per inch (dpi); fps measures video frame rate and ppm measures printing speed.
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