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doc:appunti:software:colorchecker_clones [2020/01/13 08:13] – [The Grey White Balance Colour Card: an X-Rite clone] niccolodoc:appunti:software:colorchecker_clones [2020/01/27 12:20] (current) – [Solid Pigments vs Offset Printing and Dithering] niccolo
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 ===== The ColorChecker and its Clones ===== ===== The ColorChecker and its Clones =====
  
-{{.:color_management:colorchecker_gretag-macbeth.jpg?360 |https://commons.wikimedia.org/wiki/File:Gretag-Macbeth_ColorChecker.jpg}}+[{{.:color_management:colorchecker_gretag-macbeth.jpg?360 |The original Gretag Macbeth ColorChecker. Photo from [[https://commons.wikimedia.org/wiki/File:Gretag-Macbeth_ColorChecker.jpg|wikimedia.org]]}}]
 The **[[wp>ColorChecker]]** is a registered trademark of a [[wp>Color chart|color chart]] introduced in 1976 and manufactured by **Macbeth**, now **X-Rite**; it features **24 squared patches** of various colors. The colors were choosen quite arbitrarly: six **shades of gray**, some **primary colors**  (red, green, blue, cyan, magenta, and yellow) and other colors of natural objects, like skin tones, foliage, etc. The **[[wp>ColorChecker]]** is a registered trademark of a [[wp>Color chart|color chart]] introduced in 1976 and manufactured by **Macbeth**, now **X-Rite**; it features **24 squared patches** of various colors. The colors were choosen quite arbitrarly: six **shades of gray**, some **primary colors**  (red, green, blue, cyan, magenta, and yellow) and other colors of natural objects, like skin tones, foliage, etc.
  
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 The most inexpensive color charts are obtained by **[[wp>Offset printing|offset printing]]**, the color patches are not made from solid color pigments, but obtained using **[[wp>Dither|dithering]]** and **[[wp>Halftone|halftoning]]** of the primary printing colors. The following close-up are taken from the **The 2 in 1** checker, manufactured by **[[https://www.greywhitebalancecolourcard.co.uk/|Grey White Balance Colour Cards]]**; you can see how the patches are obtained with dithering, in particular the second photo shows the **grey patches** on the left: they are made by a **white background with black dots** over it: The most inexpensive color charts are obtained by **[[wp>Offset printing|offset printing]]**, the color patches are not made from solid color pigments, but obtained using **[[wp>Dither|dithering]]** and **[[wp>Halftone|halftoning]]** of the primary printing colors. The following close-up are taken from the **The 2 in 1** checker, manufactured by **[[https://www.greywhitebalancecolourcard.co.uk/|Grey White Balance Colour Cards]]**; you can see how the patches are obtained with dithering, in particular the second photo shows the **grey patches** on the left: they are made by a **white background with black dots** over it:
  
-{{.:color_management:colorchart-dithering-1.jpg?380|A color chart produced with offset printing}} +[{{.:color_management:colorchart-dithering-1.jpg?380|The GWBCC color chart, produced with offset printing}}] 
-{{.:color_management:colorchart-dithering-2.jpg?380|A color chart produced with offset printing}}+[{{.:color_management:colorchart-dithering-2.jpg?380|The GWBCC color chart; on the left the grey patches}}]
  
 ====== Color calibration using Darktable ====== ====== Color calibration using Darktable ======
doc/appunti/software/colorchecker_clones.1578899635.txt.gz · Last modified: 2020/01/13 08:13 by niccolo