Why a (complete) list of ColorSpaces, like the one in Wikipedia, would ignore the 11 color spaces used in PDF files?

Device dependent color spaces:

  1. DeviceGray 2. DeviceRGB 3. DeviceCMYK

Device independent color spaces:

  1. CalGray 5. CalRGB 6. Lab 7. ICCBased


  1. Indexed 9. Pattern 10. Separation 11. DeviceN

They explain 2 and 3. they don't list grayscale as a color space because its not really a color space, its lack of color. Note they do explain 1 under grayscale and black and white.

  1. CalGray 5. CalRGB 6. Lab 7. ICCBased

These arent really color spaces, but rather spaces with calibration. They do list several of the calibration spaces though and explain teh context under individual spaces, as well as explain icc profiles. Here they are being somewhat inconsistent though.

  1. Indexed

Indexed isn't a color space but a compression/encoding scheme. It still uses a underlying space which wikipedia lists.

  1. Pattern 10. Separation

These are not colorspaces as such

  1. DeviceN

Okay this I agree they could list. Although it would probably need to be called something else.

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  • would you elaborate on why a "space with calibration" is not a color space? On "Indexed", "Pattern" and "Separation". These are all listed by Adobe as color spaces used in PDF, see section 8.6 of the Adobe Reference Manual adobe.com/content/dam/acom/en/devnet/pdf/PDF32000_2008.pdf – Paulo Ney Nov 28 '18 at 19:26
  • @PauloNey its a programming language of sorts they have just extended the existing tag. It does not need to have a scientific basis. "space with calibration" is not a colorspace bacuse its a space exactly like device RGB, device CMYK or device Grayscale. We just know what the name or the description of the space is. Its still just a Grayscale, RGB or CMYK space and has exactly the same properties just now with a global meaning. – joojaa Nov 28 '18 at 20:28

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