Photoshop: Why are my images are bright & vibrant in Photoshop and gray and washed out after export?

What are you viewing your images in where they look washed out? A web browser? Which one? What OS?

You'll most likely want to use sRGB when you export your images because you have no guarantees the viewer will have an application/web browser that supports color management.

I just did a job where I downloaded the full res photos to the desktop and the looked fine and then I email them to myself before sending them to a client and they are horrible. I have also noticed when I upload them to my blog and view it on anything explorer, safari, etc. they also look grey and washed out. So should my color settings be srgb when I send the tff from lightroom to photoshop and ProPhoto RGB for photoshop? Or should I keep everything Prophoto RGB and when I export them to the desktop use the srgb? Also how do I change to srgb on export? Thank you again this problem came out of nowhere.

Oh, by the way I meant when I save an image to the desktop how do I change the color setting to srgb because I only have the option of ProPhotoRGB.

I just did a job where I saved the photo full res jpeg to the desktop in ProPhotoRGB and then emailed it to myself to check it before I sent it out and it was horribly grey and washed out, but great looking on the desktop. I have also noticed the problem when I have uploaded the photo's to my blog and view it in explorer, safari, etc. Should I export the tff I tweaked in lightroom to photoshop as srgb even though my color space is Prophoto rgb or should I change both to srgb? Also when I save a full res in photoshop as a jpeg I only see an option for prophoto rgb, where is the option for srgb? Thank you again, this problem came out of nowhere!