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2. Tone mapping - Wikipedia

   en.wikipedia.org/wiki/Tone_mapping

   Luminance HDR/QtPfsGui is a free (open-source) HDR-workflow software for Linux, Windows and Mac OS X based around the pfstools package; LDR tonemapping is a free (open-source) tonemapper for low dynamic range images (a.k.a. "pseudo-HDR") Atlas is a free (open-source) port of the pfstmo tone mapping operators to Adobe After Effects

3. FastStone Image Viewer - Wikipedia

   en.wikipedia.org/wiki/FastStone_Image_Viewer

   FastStone Image Viewer is an image viewer and organizer software for Microsoft Windows, provided free of charge for personal and educational use. The program also includes basic image editing tools, [ 4 ] like cropping, color adjustment and red-eye removal.

4. Photographic print toning - Wikipedia

   en.wikipedia.org/wiki/Photographic_print_toning

   Selenium toning is a popular archival toning process, converting metallic silver to silver selenide. In a diluted toning solution, selenium toning gives a red-brown tone, while a strong solution gives a purple-brown tone. The change in color depends upon the chemical make-up of the photographic emulsion being toned.

5. Image tracing - Wikipedia

   en.wikipedia.org/wiki/Image_tracing

   For continuous tone images such as photographs, the result of color quantization is posterization. Gradient fills will also be posterized. [7] Reducing the number of colors in an image is often aided by a histogram. The most common colors may be selected as the representatives, and other colors are mapped to their closest representative.

6. GIMP - Wikipedia

   en.wikipedia.org/wiki/GIMP

   The GNU Image Manipulation Program, commonly known by its acronym GIMP (/ ɡ ɪ m p / ⓘ GHIMP), is a free and open-source raster graphics editor [3] used for image manipulation (retouching) and image editing, free-form drawing, transcoding between different image file formats, and more specialized tasks. It is extensible by means of plugins ...

7. Darktable - Wikipedia

   en.wikipedia.org/wiki/Darktable

   Darktable (stylized as darktable) is a free and open-source photography application and raw developer. Rather than being a raster graphics editor like Adobe Photoshop or GIMP, it comprises a subset of image editing operations specifically aimed at non-destructive raw image post-production. It is primarily focused on improving a photographer's ...

8. List of monochrome and RGB color formats - Wikipedia

   en.wikipedia.org/wiki/List_of_monochrome_and_RGB...

   The 4-bit RGBI palette is similar to the 3-bit RGB palette but adds one bit for intensity. This allows each of the colors of the 3-bit palette to have a dark and bright variant, potentially giving a total of 2 3 ×2 = 16 colors. However, some implementations had only 15 effective colors due to the "dark" and "bright" variations of black being ...

9. 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 ...