The web browser is the main place that people see the effect of mismatched gamma. Prior the definition of HTML 4.0 there was no official standard as to the default color space of web pages and images. Pages created on mac's had a gamma of about 1.8 while pages created on pc's had a gamma of about 2.5. This created obvious problems with pages either being to light or to dark. Starting with HTML 4.0 it was decided that all unlabled images and colors would be in the srgb color space which has a gamma of 2.2. This maintains compatability with existing web pages which are all unlabled. In theory this means that all web pages should look the same on all systems, in theory.

Currently few web browsers do any kind of gamma correction, let alone full color correction. This means web pages display as they always have. However, if the web pages was created on a srgb system or the design tools did color corection then the page would display close to the orignal. It would be a little dark on a pc and a little light on a mac but it would not be as bad as before. Some browsers, notably mozilla, do some gamma correction but they assume the display is srgb which is not always correct. Hopefully this will be corrected so we can specify the actuall display_gamma. Or better yet they will pull it from the displays icc profile.

In the future, probably far future, browsers will use full CMS for proper color correction. When that happens all web pages should look the same on all systems. Well, if they have the correct display profile selected that is.

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