The practical effect of high-resolution technique is less that of increasing quality as reducing degradation.
—JOHN B. WILLIAMS
Psychophysics: The behavioral study of quantitative relations between people’s perceptual experiences and corresponding physical properties.
—STEPHEN E. PALMER
Everyone wants to be able to make good, sharp photographs, and most of us immediately recognize whether an image is sharp. Also, I have noticed that judges in photo competitions often say that they are checking for “critical sharpness.” But what does that really mean? We have to look deeper and define some terms. What photographers are really concerned with is image quality (IQ), a feature ...