1) Measure of film sharpness 
=== Resampling === Low-pass filtering and resampling often cause overshoot, which increases acutance, but can also reduce absolute gradient, which reduces acutance. Filtering and resampling can also cause clipping and ringing artifacts. An example is bicubic interpolation, widely used in image processing for resizing images. == Definition == One d...
(from the article `photography, technology of`) ...scatter or irradiation within the emulsion (which tends to spread image details) and on the contrast with which the film reproduces fine detail. ...
A measure of the sharpness with which the film can produce the edge of an object. 
acutance The sharpness of a photographic or printed image; a numerical measure of this.
a measure of the sharpness with which a film can reproduce the edge of an object.