Canon eos rebel t1i - Manual (Page 93)

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The color space refers to the range of reproducible colors. With this
camera, you can set the color space for captured images to sRGB or
Adobe RGB. For normal shooting, sRGB is recommended.
In the Basic Zone modes, sRGB is set automatically.
1
Select [Color space].
Under the [2] tab, select [Color
space], then press <0>.
2
Set the desired color space.
Select [sRGB] or [Adobe RGB], then
press <0>.
This color space is mainly used for commercial printing and other
industrial uses. This setting is not recommended if you do not know
about image processing, Adobe RGB, and Design rule for Camera File
System 2.0 (Exif 2.21).
Since the image will look very subdued with an sRGB computer
environment and printers not compatible with Design rule for Camera
File System 2.0 (Exif 2.21), post-processing of the image with software
will be required.
3 Setting the Color SpaceN
About Adobe RGB
If the image is captured with the color space set to Adobe RGB, the file
name will start with “_MG_” (first character is an underscore).
The ICC profile is not appended. The ICC profile is explained in the
Software Instruction Manual in the CD-ROM.