Attached Link: http://www.imagescience.com.au/kb/questions/85/January+2005+-+ProPhoto+or+ConPhoto

Hey Tom,

 I can see a real difference in (most) prints from my 6 color Epson when using AdobeRGB compared to sRGB.

While you can’t see a difference on a typical monitor, the color space of sRGB is narrower than what most home and commercial printers are capable of.

The AdobeRGB gamut is a closer match for them, while you are being short-changed with sRGB.

The ProPhotoRGB, space is huge!

Much larger than what any monitor can show, and printer can produce.

I have used it, but the printed results were too unpredictable… (Always felt like I was flying blind).

 

This article (link) is a little dated, but still informative and relevant.

 

Chuck