willie_901
Veteran
Meaningful Sharpness Is Complicated and Messy
Meaningful Sharpness Is Complicated and Messy
Perceived image sharpness is a subjective topic. It is also an endless topic because everyone has a different view about meaningful sharpness.
Objective sharpness (I'm not sure it's even a good idea to still use the word sharpness) is a completely different topic.
The International Standards Organization developed and published a thee-part standard, ISO 20462, "A psychophysical image quality measurement standard". ISO 20462 is discussed in this peer-reviewed journal article. ISO 20462 attempts to interpret subjective image assessment in a "calibrated manner".
Another complication of "meaningful sharpness" involves considering the system MTF50 instead of just the lens MTF50. The system would include the sensor's optical path (AA filter, micro-lens array, etc) and pixel density; the raw file demosaicking algorithms and image rendering parameters; the display monitor's characteristics; the printer hardware and interpolation software and the print media.
Meaningful Sharpness Is Complicated and Messy
Perceived image sharpness is a subjective topic. It is also an endless topic because everyone has a different view about meaningful sharpness.
Objective sharpness (I'm not sure it's even a good idea to still use the word sharpness) is a completely different topic.
The International Standards Organization developed and published a thee-part standard, ISO 20462, "A psychophysical image quality measurement standard". ISO 20462 is discussed in this peer-reviewed journal article. ISO 20462 attempts to interpret subjective image assessment in a "calibrated manner".
Another complication of "meaningful sharpness" involves considering the system MTF50 instead of just the lens MTF50. The system would include the sensor's optical path (AA filter, micro-lens array, etc) and pixel density; the raw file demosaicking algorithms and image rendering parameters; the display monitor's characteristics; the printer hardware and interpolation software and the print media.