a Super PNG with the embedded SRGB color profile
Note that on different browsers, the PNGs have different gamma corrections applied to them, and
rarely match the colorspace that CSS/HTML uses. Since it's different browser to browser, PNGs
are not a good choice for images where it's important to match the color of the surrounding HTML.
In Particular, 3 prominent mac browsers all rendered these differently.
Safari applied a gamma "correction" to the png, making it darker than the HTML from which it was taken.
Safari also applied an even darker gamma to the super PNG.
IE 5.5 applied a darker gamma to the PNG. Super PNG and PNG were treated the same.
Only Mozilla Firebird (and any Gecko based browser - Mozilla, Netscape 6/7, Camino) applied a gamma to the PNG
which made it match the HTML colorspace. Only there are the colors consistent.
It's debatable which approach is most correct. This link explains how
PNG's gamma correction was doomed to begin with.
Here are screenshots of the different Mac browsers:
