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  2. Kirlian photography - Wikipedia

    en.wikipedia.org/wiki/Kirlian_photography

    Kirlian photograph of two coins. Kirlian photography is a collection of photographic techniques used to capture the phenomenon of electrical coronal discharges.It is named after Soviet scientist Semyon Kirlian, who, in 1939, accidentally discovered that if an object on a photographic plate is connected to a high-voltage source, an image is produced on the photographic plate. [1]

  3. Grayscale - Wikipedia

    en.wikipedia.org/wiki/Grayscale

    Web-safe color. v. t. e. In digital photography, computer-generated imagery, and colorimetry, a greyscale (more common in Commonwealth English) or grayscale (more common in American English) image is one in which the value of each pixel is a single sample representing only an amount of light; that is, it carries only intensity information.

  4. Unsharp masking - Wikipedia

    en.wikipedia.org/wiki/Unsharp_masking

    Unsharp masking (USM) is an image sharpening technique, first implemented in darkroom photography, but now commonly used in digital image processing software. Its name derives from the fact that the technique uses a blurred, or "unsharp", negative image to create a mask of the original image. The unsharp mask is then combined with the original ...

  5. High-speed photography - Wikipedia

    en.wikipedia.org/wiki/High-speed_photography

    Muybridge's photographic sequence of a race horse galloping, first published in 1878. High-speed photography is the science of taking pictures of very fast phenomena. In 1948, the Society of Motion Picture and Television Engineers (SMPTE) defined high-speed photography as any set of photographs captured by a camera capable of 69 frames per second or greater, and of at least three consecutive ...

  6. Time-lapse photography - Wikipedia

    en.wikipedia.org/wiki/Time-lapse_photography

    Time-lapse photography is a technique in which the frequency at which film frames are captured (the frame rate) is much lower than the frequency used to view the sequence. When played at normal speed, time appears to be moving faster and thus lapsing .

  7. Golden hour (photography) - Wikipedia

    en.wikipedia.org/wiki/Golden_hour_(photography)

    Golden hour (photography) Four photos taken during golden hour. In photography, the golden hour is the period of daytime shortly after sunrise or before sunset, during which daylight is redder and softer than when the sun is higher in the sky. The golden hour is also sometimes called the magic hour, especially by cinematographers and ...

  8. Thresholding (image processing) - Wikipedia

    en.wikipedia.org/wiki/Thresholding_(image...

    low level of noise; higher intra-class variance than inter-class variance, i.e., pixels from a same group have closer intensities to each other than to pixels of another group, homogeneous lighting, etc. In difficult cases, thresholding will likely be imperfect and yield a binary image with false positives and false negatives.

  9. Exposure (photography) - Wikipedia

    en.wikipedia.org/wiki/Exposure_(photography)

    In photography, exposure is the amount of light per unit area reaching a frame of photographic film or the surface of an electronic image sensor. It is determined by shutter speed, lens F-number, and scene luminance. Exposure is measured in units of lux - seconds (symbol lx ⋅ s), and can be computed from exposure value (EV) and scene ...