| Unsharp masking is an image manipulation technique of increasing the acutance, or apparent sharpness, of photographic images. |
| It is a fast-working, fog-free, stain-free agent that dissolves easily in cold water, keeps extremely well and produces negatives of very high acutance. |
| These effects can be measured physically to give an acutance value, which is preferred to resolving power as a criterion of a film's sharpness performance. |
| Due to the unique structure of ROLLEI R³, the developer has a strong effect on film speed, grain and acutance. |
| Because of the tanning effect of catechol on emulsion gelatine, it has many of the properties of pyrogallol, including high acutance and low fog. |
| Highlight separation, sharpness and acutance are increased because they give more pronounced edge effects than other developers. |
