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  2. Photographic print toning - Wikipedia

    en.wikipedia.org/wiki/Photographic_print_toning

    Sepia toning is a specialized treatment to give a black-and-white photographic print a warmer tone and to enhance its archival qualities. The metallic silver in the print is converted to a sulfide compound, which is much more resistant to the effects of environmental pollutants such as atmospheric sulfur compounds.

  3. Tone mapping - Wikipedia

    en.wikipedia.org/wiki/Tone_mapping

    Tone mapped high-dynamic-range (HDR) image of St. Kentigerns Roman Catholic Church in Blackpool, Lancashire, England, UK. Tone mapping is a technique used in image processing and computer graphics to map one set of colors to another to approximate the appearance of high-dynamic-range (HDR) images in a medium that has a more limited dynamic range.

  4. Image color transfer - Wikipedia

    en.wikipedia.org/wiki/Image_color_transfer

    Image color transfer is a function that maps (transforms) the colors of one (source) image to the colors of another (target) image. A color mapping may be referred to as the algorithm that results in the mapping function or the algorithm that transforms the image colors.

  5. Tone reproduction - Wikipedia

    en.wikipedia.org/wiki/Tone_reproduction

    In the theory of photography, tone reproduction is the mapping of scene luminance and color to print reflectance or display luminance, [1] with the aim of subjectively "properly" reproducing brightness and "brightness differences". [2] The reproduction of color scenes in black-and-white tones is one of the long-time concerns of photographers. [3]

  6. Halftone - Wikipedia

    en.wikipedia.org/wiki/Halftone

    The first printed photo using a halftone in a Canadian periodical, October 30, 1869 A multicolor postcard (1899) printed from hand-made halftone plates. While there were earlier mechanical printing processes that could imitate the tone and subtle details of a photograph, most notably the Woodburytype, expense and practicality prohibited their being used in mass commercial printing that used ...

  7. Color grading - Wikipedia

    en.wikipedia.org/wiki/Color_grading

    The evolution of digital color grading tools has advanced to the point where the colorist can use geometric shapes (such as mattes or masks in photo software such as Adobe Photoshop) to isolate color adjustments to specific areas of an image. These tools can highlight a wall in the background and color only that wall, leaving the rest of the ...

  8. Help : How to reduce colors for saving a JPEG as PNG

    en.wikipedia.org/wiki/Help:How_to_reduce_colors...

    Sometimes, you find a drawing or similar image useful for a Wikipedia article, that was saved as a JPEG but should have been saved as a PNG.JPEG is good for images where the color changes fluidly throughout the image, like in a photograph, whereas PNG files are good for images with relatively few colors, such as a drawing of a flag, a chart, or a map; note that sometimes SVG is better.

  9. Color balance - Wikipedia

    en.wikipedia.org/wiki/Color_balance

    The left half shows the photo as it came from the digital camera. The right half shows the photo adjusted to make a gray surface neutral in the same light. In photography and image processing, color balance is the global adjustment of the intensities of the colors (typically red, green, and blue primary colors). An important goal of this ...

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