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  2. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Increase contrast of yellow objects A 25 Increase contrast of brown objects B2 58 Increase contrast of red objects; commonly known as B C5 47 Photograph blue as white; replaces C4 (#49) with a comparable filter factor as updated A and B2 F 29 Blueprints; photograph red as white Three-color separation A 25

  3. Histogram equalization - Wikipedia

    en.wikipedia.org/wiki/Histogram_equalization

    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.

  4. Contrast (vision) - Wikipedia

    en.wikipedia.org/wiki/Contrast_(vision)

    Contrast sensitivity is typically expressed as the reciprocal of the threshold contrast for detection of a given pattern (i.e., 1 ÷ contrast threshold). [15] Using the results of a contrast sensitivity exam, a contrast sensitivity curve can be plotted, with spatial frequency on the horizontal, and contrast threshold on the vertical axis.

  5. Staining - Wikipedia

    en.wikipedia.org/wiki/Staining

    Staining is a technique used to enhance contrast in samples, generally at the microscopic level. Stains and dyes are frequently used in histology (microscopic study of biological tissues ), in cytology (microscopic study of cells ), and in the medical fields of histopathology , hematology , and cytopathology that focus on the study and ...

  6. Diffusion-weighted magnetic resonance imaging - Wikipedia

    en.wikipedia.org/wiki/Diffusion-weighted...

    When water is in an environment where it can freely tumble, relaxation tends to take longer. In certain clinical situations, this can generate contrast between an area of pathology and the surrounding healthy tissue. To sensitize MRI images to diffusion, the magnetic field strength (B1) is varied linearly by a pulsed field gradient.

  7. Promoting Healthy Choices: Information vs. Convenience - HuffPost

    images.huffingtonpost.com/2012-12-21-promoting...

    dramatic increase in obesity. In 1991, only four states had obesity prevalence rates as high as 15-19% and not a single state had a rate above 20%. By 2005, only four states reported rates below 20%, with 17 states registering rates equal to or above 25% (Center for Disease Control and Prevention, 2006).

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