Alex R wrote:

Web browsers ignore all color space information

Yes, on PC systems.

and assume that everything is in sRGB.

Web browsers (in Windows) do not make such an assumption, they do not need to make any choices so they do not need to make any assumptions either. They simply throw the image data as it is (without any color management) to the display driver and from there to the monitor.

There are no monitors that are in the sadRGB space.

The profile size of the sadRGB is 3144 bytes where normal RGB working-space profiles are just about 552 bytes. The difference comes from the fact that the transfer-function of the three channels in the sadRGB profile are look-up-tables (with only 10-bits resolution) where the normal RGB working-.space profiles specify an accurate gamma function mathematically.

The transfer-function of the sadRGB is _about_ gamma 2.2 but not at all so in the dark end of the range. So, when you e.g. look at a dark key image that is in the sadRGB color-space inside Photoshop you'll see the dark end much better than how it appears in the browser (in a system that is calibrated to gamma 2.2 space). In case the CRT is not gamma calibrated then it is in gamma 2.5 space (vast majority of the computers on the Web are like that) and the sadRGB images look notable darker in overall on them. So the best choice for Web publishing is a normal gamma 2.5 profile like the nativePC is.

Al Dykes wrote:

If I save a JPG file with an ICC profile does any web
browser use it when the file is displayed ?

This has been already explained but there is an obvious question that remains unanswered: Why did Microsoft provide the ICC managed IE browser for the Mac OS (it has been there already what, about 2 years I think) but they still do not provide that same feature for the IE on the PC systems???

Timo Autiokari

AlexR

Replied in the following topics

ICC Profiles in JPG files and Web browsers ?