ITPEC IP October 2019 Question 4
Topic: Multimedia
Which of the following is the appropriate combination of compression technology standards for still images, moving images, and audio?
Explanation
GIF, MPEG, MP3 — GIF compresses still images, MPEG moving images, and MP3 audio.
- •JPEG and GIF: still images; JPEG suits photographs (lossy), GIF illustrations and icons (up to 256 colours, lossless)
- •MPEG: moving images, video with its sound, named after the Moving Picture Experts Group
- •MP3: audio; the name is short for MPEG Audio Layer 3, the sound part of an MPEG standard
Only (b) puts every standard in the column of its own medium.
Answer (b)
Why not others:
- •(a) — every column is wrong: MP3 is audio, JPEG a still-image format, and GIF an image format, not audio
- •(c) — swaps the first two: MPEG is the moving-image standard and GIF the still-image one; only MP3 is in place
- •(d) — JPEG is right for still images, but MP3 is audio, not video, and GIF is an image format, not audio
Key rule: The names give the medium away: JPEG comes from the Joint Photographic Experts Group (photos), MPEG from the Moving Picture Experts Group (video), and MP3 is MPEG's audio layer.
Multimedia · AI-written, may contain errors
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