The Canon 7D supports 2 colour spaces:

  • sRGB
  • Adobe RGB (1998)

So which one to use? That will depend on what further processing you will be doing.

sRGB

The colour gamut of sRGB is around 35% of the visible colours specified by CIE, the International Commission on Illumination. The colour gamut is still wide enough for almost all applications. It’s used by:

  • Almost all web browsers
  • Almost all screen monitors
  • Almost all printers
  • Almost all commercial printers that do not use the CMYK

The file names produced by the Canon 7D are like “IMG_1234.CR2

Adobe RGB (1998)

Adobe in 1998 created the aRGB. The colour gamut of aRGB is around 50% of the visible colours specified by CIE, the International Commission on Illumination. It uses only the RGB primary colours. It’s used by:

  • A few and expensive wide gamut display monitors
  • Very few printers
  • It’s to be mostly used when you plan on passing the photo to a photo editor that supports Adobe RGB, like PhotoShop.

The file names produced by the Canon 7D are like “_MG_1234.CR2” with the underscore at the beginning.

  1. In general, you should use sRGB unless you need aRGB for a specific process/output device.
  2. All JPEGs are in sRGB. So taking a photo in aRGB will not match the output in the sRGB colour space even with calibration.