Most displays are tuned for sRGB and can't display AdobeRGB colors very well. Other displays, which are specifically for photography, can show AdobeRGB but can't show sRGB very well.


Printers can show more of AdobeRGB. Many colors that are impossible in sRGB become possible in AdobeRGB. Most of the time, with most images, even with a high quality printer, the difference is subtle or none at all.


And, of course, the setting only applies to in-camera JPEG. I suggest that you shoot RAW instead, then use ProPhoto RGB, which is wider than either sRGB *or* AdobeRGB. It would be bad to use at 8-bit, but at 16-bit it is excellent. It will be possible to print more colors than even Adobe RGB.