Recently I've updated Chrome to v.26 and pictures which were displayed using HTML5 canvas were not visible anymore. As I found I had to change to brightness and contrast.
How are the values for BC for CSS filters different depending on the browser engine?
Default:
Brightness: 0; contrast 100: Firefox ?
Brightness:100; contrast:100: Chrome ?
As I found out it is actually a bug fix for Chrome: https://code.google.com/p/chromium/issues/detail?id=168004
I found this and it will certainly help you. The syntax is something like this.
.thing_you_want_to_filter {
/*
these are all default values, note that hue-rotate and blur have units.
You'll also need to include the vendor prefixes.
*/
filter: grayscale(0);
filter: sepia(0);
filter: saturate(1);
filter: hue-rotate(0deg);
filter: invert(0);
filter: opacity(1);
filter: brightness(0);
filter: contrast(1);
filter: blur(0px);
/* Drop shadow has the same syntax as box-shadow – see below for why it's amazing! */
filter: drop-shadow(5px 5px 10px #ccc);
}
Chrome 18.0+ and Safari 6+ are the only browsers that support this. For Safari under version 6 it would be like this:
.img
{
-webkit-filter:contrast(100%); /* play with the percentages */
-webkit-filter:brightness(100%);
}
You can read the sources yourself
http://net.tutsplus.com/tutorials/html-css-techniques/say-hello-to-css3-filters/ http://css3.bradshawenterprises.com/filters/
来源：https://stackoverflow.com/questions/15758007/default-css-filter-values-for-brightness-and-contrast