Module viewing 

Viewing condition modeling for perceptual quality assessment.

This module provides the ViewingCondition type which models how an image will be viewed, affecting perceptual quality thresholds.

Key Concepts

• acuity_ppd: The viewer’s visual acuity in pixels per degree. This is determined by the display’s pixel density and viewing distance.
• browser_dppx: The browser/OS device pixel ratio (e.g., 2.0 for retina).
• image_intrinsic_dppx: The image’s intrinsic pixels per CSS pixel (for srcset).
• ppd: The effective pixels per degree for this specific image viewing.

Structs

ViewingCondition

Viewing condition for perceptual quality assessment.