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Consequently, calotype photographs can show bold outlines and high-contrast details clearly, but low-contrast details and textures tend to be lost because of non-uniform paper transmittance. Paper texture effects are limiting in nature photography, for example, where one expects to capture subtle patterns such as those produced by plants ...
The basic intent of the contrast enhancement technique is to adjust the local contrast in the image so as to bring out the clear regions or objects in the image . Low-contrast images often result from poor or non-uniform lighting conditions, a limited dynamic range of the imaging sensor, or improper settings of the lens aperture.
The maximum contrast of an image is termed the contrast ratio or dynamic range. In images where the contrast ratio approaches the maximum possible for the medium, there is a conservation of contrast. In such cases, increasing contrast in certain parts of the image will necessarily result in a decrease in contrast elsewhere.
This technique works well, but it can obscure fine, low contrast detail. Dynamic range (or exposure range) is the range of light levels a camera can capture, usually measured in f-stops, EV (exposure value), or zones (all factors of two in exposure). It is closely related to noise: high noise implies low dynamic range.
Film negatives usually have less contrast, but a wider dynamic range, than the final printed positive images. The contrast typically increases when they are printed onto photographic paper. When negative film images are brought into the digital realm, their contrast may be adjusted at the time of scanning or, more usually, during subsequent ...
This method usually increases the global contrast of many images, especially when the image is represented by a narrow range of intensity values. Through this adjustment, the intensities can be better distributed on the histogram utilizing the full range of intensities evenly. This allows for areas of lower local contrast to gain a higher contrast.
Orthochromatic, low contrast, low iso BW positive film. This film is a Dactylographic film, used in the study of finger prints. This film will produce a BW positive when processed in standard BW chemistry. 135-24 FPP: Mz3 Fine Grain: available: P: 3: B&W: Print: Black and white, very slow speed, blue sensitive film with fine grain? 135-24 FPP
Contrast resolution or contrast-detail is an approach to describing the image quality in terms of both the image contrast and resolution. Contrast resolution is usually measured by generating a pattern from a test object that depicts how image contrast changes as the structures being imaged get smaller and closer together.