Bug 24058 - [Chrome] opacity:0.x; === PNG loosing alpha channel transparency
Summary: [Chrome] opacity:0.x; === PNG loosing alpha channel transparency
Status: RESOLVED INVALID
Alias: None
Product: WebKit
Classification: Unclassified
Component: CSS (show other bugs)
Version: 525.x (Safari 3.2)
Hardware: PC OS X 10.5
: P2 Normal
Assignee: Nobody
URL:
Keywords: HasReduction, PlatformOnly
Depends on:
Blocks:
 
Reported: 2009-02-20 00:13 PST by Tomasz Wota
Modified: 2009-02-20 09:03 PST (History)
3 users (show)

See Also:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Tomasz Wota 2009-02-20 00:13:13 PST 
Using Webkit 525.19 (Google Chrome) I noticed that if I set CSS opacity:0.x on div which background-image is set to partially transparent PNG - the image looses its transparency in favour of white color. 
I don't know if this problem is addressed in 528+
Comment 1 Mark Rowe (bdash) 2009-02-20 00:30:45 PST 
Can you please provide a test case that demonstrates this problem?
Comment 2 Tomasz Wota 2009-02-20 00:49:37 PST 
I just made a testcase - and I had to modify this entry - the transparency is not loosed entirely, only those pixels that are "semitransparent" - partially transparent, or however I should call it - are improperly displayed. Fully transparent ones are left as they were.
testcase URL:
http://azi-testy.comoj.com/webkit_test/test_case.html
Comment 3 Mark Rowe (bdash) 2009-02-20 00:54:26 PST 
I suspect this is a Chrome-specific bug as the test case behaves identically in Safari, a WebKit nightly build, and Firefox.
Comment 4 Tomasz Wota 2009-02-20 01:14:29 PST 
I downloaded Safari 3.2.2 (525.28.1) and run the test sample - no ugly white gif-like border around the red sample text.
It sure looks like Chrome specific bug.
Comment 5 Dimitri Glazkov (Google) 2009-02-20 09:03:33 PST 
Yes, this is a Chromium issue. Please follow up here: http://crbug.com/6372, http://crbug.com/2791