6 Compression and Media Optimization Free Online FlashCards

What does media compression do?

Compression represents media using fewer bits, reducing the storage space or bandwidth it requires.

How do a file format and a codec differ?

A format defines how data and related information are organized; a codec is a method for encoding and decoding media.

What is lossless compression?

Lossless compression reduces file size without discarding information, so decompression reproduces the original data exactly.

Name a common lossless image format and audio format.

PNG images and FLAC audio are common examples of lossless compression.

Why avoid repeatedly re-encoding lossy media?

Re-encoding can add further quality loss. Keep an original or high-quality master and make delivery copies from it.

What is the usual effect of stronger lossy compression?

Reducing data rate or increasing lossy compression generally makes a file smaller but can lower its quality.

Which compression approach suits logos, text, and diagrams?

Favor lossless compression to preserve sharp edges in logos, text, and diagrams.

How can image dimensions be optimized for display?

Use image dimensions close to the actual display size to avoid retaining unnecessary image data.

What is lossy compression?

Lossy compression reduces file size by permanently discarding some information, often details less noticeable to people.

Name a common lossy image format and audio format.

JPEG images and MP3 audio are familiar examples of lossy compression.

What compression options does WebP support?

WebP supports both lossy and lossless compression modes.

What tradeoff can come from raising video bitrate?

Raising video bitrate often improves clarity but increases file size; the precise result depends on the codec and media.