Setting Up Your Application for Web Design
Color Settings – When designing for the web, you should change your Proof Setup setting to Monitor RGB (sRGB). If not, your colors will shift and no longer matching your original design. The reason for the shift in color is that when you choose Save for Web, Photoshop automatically converts your image to sRGB and strips away any color profile attached, since web browsers don’t support color profiles. You can find this setting under View > Proof Setup > Monitor RGB.