Proof Colors in Photoshop

What if you want to see how the image is going look when it&converted to CMYK while still working in the RGB color space? Photoshop can simulate----on screen----how color will be affected (and lost) when images are converted to CMYK, while keeping the image in the RGB color space. Select View - Proof Colors and you have the best of both worlds----a preview of how the image will look when its converted to CMYK while retaining all of the RGB information for color correction.