Computer Science for IGCSE & O level - Data Representation (Section 5 - No. 28)
What are the two key concepts the JPEG reduction process is based on?
Human eyes don't detect differences in colour shades quite as well, and they have differentness in image brightness.
Human eyes perceive the colour and brightness variations simultaneously
The human eye is more sensitive to the colour variations.
The human eye always notices colour and brightness differences
Maelezo
The JPEG standard uses human eye sensitivity to different brightness and colour variations to compress images effectively.