| Because of the tanning effect of catechol on emulsion gelatine, it has many of the properties of pyrogallol, including high acutance and low fog. |
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| Highlight separation, sharpness and acutance are increased because they give more pronounced edge effects than other developers. |
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| Due to the unique structure of ROLLEI R³, the developer has a strong effect on film speed, grain and acutance. |
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| Unsharp masking is an image manipulation technique of increasing the acutance, or apparent sharpness, of photographic images. |
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| 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. |
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| 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. |
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| Fine-grain films with thin emulsions yield the highest acutance. |
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