What technique is used by JPEGs for compression?

The correct answer is C. DCT. JPEG uses the Discrete Cosine Transform (DCT) as its core compression algorithm. The image is divided into 8Ã-8 pixel blocks, and DCT converts each block from the spatial domain into the frequency domain. High-frequency components (fine detail less perceptible to human vision)…

Submitted by diego_uy· Apr 18, 2026Disk Forensics

Question

Options

ATIFF-8
BZIP
CDCT
DTCD

How the community answered

(38 responses)

A
5% (2)
B
3% (1)
C
92% (35)

Explanation

JPEG uses the Discrete Cosine Transform (DCT) as its core compression algorithm. The image is divided into 8Ã-8 pixel blocks, and DCT converts each block from the spatial domain into the frequency domain. High-frequency components (fine detail less perceptible to human vision) are then quantized and discarded, achieving lossy compression. This is fundamentally different from lossless formats like PNG (which use DEFLATE/ZIP) or TIFF variants.

Topics

#JPEG compression#DCT#File formats#Digital image analysis

Community Discussion

No community discussion yet for this question.

Full 312-49 Practice