Most web browsers (and some programs) are not colour profile aware and therefore in those circumstances you will be veiwing them in your monitors color space. When the srgb colour space was brought out ten years ago it matched the display of most low end computer monitors and hence the advise to use srgb for the web. The truth is that now most decent monitors can display a larger color gamut than srgb, so now srgb does not match your monitors color gamut now and hence the slight difference you are seeing on the web.
By the way using your montor profile as a color space does not mean others will see your images as you do because no two monitors are the same :)

Thanks for the interesting post.

I believe that saving an image with no profile is equivalent to using an absolute RGB colour space covering all colours. When that image is viewed in a web browser with a calibrated monitor, the monitor should display the image correctly (assuming all colours are within its gamut). That should hold true for all calibrated monitors, not just mine.

When I open that image in PS, and attach my monitor profile, I am making sure that what I see is what will appear in a web browser. Or at least it seems to work. :D

Obviously when the monitor is not calibrated, the image will not look the same. I use a CRT monitor, and the colour cast between uncalibrated and calibrated is very significant. That was also true for my previous CRT monitor, though TFT do not seem so bad.

An example of converting an image with a profile. (Which is different to assigning a profile)

The original image (A) in the center was a bitmap colour test file.
Image (B) was the test file called into PS with a sRGB working space and converted to Adobe RGB and saved in Bitmap format.
Image (C) was the test file called into PS with a Adobe RGB working space and converted to sRGB and saved in Bitmap format.

I then merged the 3 images and had to Post as Jpeg with no profile assigned as the forum will not accept bmp files.

It can be seen that B looks duller than A and C looks brighter than A.

The other images were saved with Profiles Assigned just to see if they look any different on here.

Note: I did not use ImageReady at all to process these files.