An Experiment - - HDR Images

Ed, My screen is calibrated to sRGB.

This statement piques my curiosity a bit.

Calibration involves a photometric measurement of standard, profile-free color patches on a screen. The measured data is used to construct an LUT or sets of RGB regression curves called a "monitor profile," which is used to interpret image data, together with the image's color space, for display. A monitor is not calibrated "to sRGB" nor any other color space. In a color-managed viewer (like Safari) an image in any color space will look the same as in another. A calibration profile makes those colors correct, or at least the same as on any other calibrated monitor.

A monitor profile has the same format as a color space like sRGB. In fact, you can specify sRGB in place in place of a righteous calibration profile. The colors won't be accurate, and in fact, look unusually bright, contrasty and saturated.