ITPEC IP April 2018 Question 25
Which of the following is an international standard for a compression method for still (or static) images?
Explanation
JPEG — the international standard for compressing still images, mainly photographs.
JPEG (Joint Photographic Experts Group) is standardised by ISO/IEC and ITU-T. It usually compresses lossily: it discards detail the eye hardly notices, and the compression ratio can be chosen to trade image quality against file size. Photos from digital cameras and on web pages are typically JPEG.
Answer (b)
Why not others:
- •(a) BMP — the Windows bitmap file format, normally stored uncompressed; not an international compression standard
- •(c) MPEG — the international standard for compressing moving pictures (video) and their audio
- •(d) PCM — pulse code modulation, which turns an analogue signal such as sound into digital data by sampling, quantising and coding
Key rule: JPEG compresses still images, MPEG compresses video, and PCM digitises analogue audio.
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