User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:188.8.131.52) Gecko/20100625 Firefox/3.6.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:184.108.40.206) Gecko/20100625 Firefox/3.6.6
With gray text on a white background, some values of CSS opacity result in yellow tinting of the text. See the example URL. I will attach screenshots below.
Disabling ClearType causes text to appear correctly. I tried in Safe Mode and the tinting still appears there. The problem does not occur in Firefox 2.0 or Chrome 5.0.
Steps to Reproduce:
1. View the testcase
Text appears yellow tinted on the indicated lines
All text should look gray
OS: Windows 7 Professional
Processor: Intel Core 2 Duo T8100 2.10GHz
Video: NVIDIA GeForce 8600M GS, Driver v220.127.116.1162
Created attachment 456384 [details]
Created attachment 456385 [details]
Screenshot from Firefox 3.6.6
Created attachment 456386 [details]
Screenshot from Firefox 18.104.22.168
Created attachment 456387 [details]
Screenshot from Chrome 5.0.375.99
Created attachment 456388 [details]
Screenshot from Firefox 4.0b1
Confirming that this happens on Firefox 4.0b1 as well.
Mozilla/5.0 (Windows; U; Windows NT 6.1; WOW64; en-US; rv:2.0b1) Gecko/20100630 Firefox/4.0b1
James, I don't see the yellow fringing you're seeing. I suspect the underlying problem may be related to bug 363861. Could you attach a screenshot of the testcase noted in comment 64 on that bug as it displays on your machine?
Created attachment 457236 [details]
Screenshot of opacity test from 363861#c64
Created attachment 457249 [details]
closeup of opacity test screenshot
Closeup of some values, each shows the result of rendering with a color and that *same* color + opacity = 0.99. Note how the fringe colors are radically different.
Wow, I can't believe how wrong that is, I don't see anything this wrong under either XP or Win7.
James, could you try running with a test build that I put together for the Cleartype opacity bug? The link is described in bug 363861, comment 76. It would interesting to see what results you get when displaying the opacity pinwheel test case, bug 363861, comment 64.
Created attachment 461111 [details]
Screenshot of opacity test under test build
Looking much better!
This was fixed by bug 363961.