The resulting print appears more acute than one made without the unsharp mask: its acutance is increased. ![]() Thus, if the resulting enlarged image is recorded on contrasty photographic paper, the partial cancellation emphasizes the high-spatial-frequency information (fine detail) in the original, without loss of highlight or shadow detail. In addition, the mask effectively reduces the dynamic range of the original negative. When light is passed through both negative and in-register positive (in an enlarger, for example), the positive partially cancels some of the information in the negative.īecause the positive has been blurred intentionally, only the low-frequency (blurred) information is cancelled. After processing this blurred positive is replaced in contact with the back of the original negative. ![]() However, the positive copy is made with the copy material in contact with the back of the original, rather than emulsion-to-emulsion, so it is blurred. For the photographic darkroom process, a large-format glass plate negative is contact-copied onto a low-contrast film or plate to create a positive image.
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