Closed
Bug 564886
Opened 14 years ago
Closed 13 years ago
getImageData gives back wrong results
Categories
(Firefox :: General, defect)
Tracking
()
RESOLVED
INVALID
People
(Reporter: mudcube, Unassigned)
Details
(Whiteboard: [CLOSEME 2011-1-30])
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 GTB7.0 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 GTB7.0 There is a bug in newest Firefox (not in older versions). The following function should return the same results: it sets a pixel, and then grabs the data from that pixel. <html> <body> <script> (function() { var canvas = document.createElement("canvas"), ctx = canvas.getContext("2d"), rgb = [ 30, 120, 255, 255 ]; ctx.fillStyle = "rgba("+rgb+")"; ctx.fillRect(0, 0, 1, 1); var imageData = ctx.getImageData(0, 0, 1, 1), data = imageData.data; alert(data[0] + "," + data[1] + "," + data[2] + " == " + rgb[0] + "," + rgb[1] + "," + rgb[2]); })(); </script> </body> Reproducible: Always Steps to Reproduce: 1. Run code in "Details" Actual Results: 11,105,255 == 30,120,255 Expected Results: 11,105,255 == 11,105,255 This is a new bug, previous Firefox versions worked properly.
My expected results should read: 30,120,255 == 30,120,255 Also, there was a typo on the test, this line: rgb = [ 30, 120, 255, 255 ]; should be replaced with this: rgb = [ 30, 120, 255, 1 ]; makes no difference on test results, but, it's a notice-able typo.
Comment 3•14 years ago
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This might be a Mac only bug. I'm running the same version on Ubuntu with color management enabled and I'm not having this problem: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.3) Gecko/20100423 Ubuntu/10.04 (lucid) Firefox/3.6.3 - Build ID: 20100423141150 When I run the above test in my error console, I get the following output alerted: "30,120,255 == 30,120,255"
Comment 4•14 years ago
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(In reply to comment #3) > This might be a Mac only bug. I'm running the same version on Ubuntu with color > management enabled and I'm not having this problem: > Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.3) Gecko/20100423 > Ubuntu/10.04 (lucid) Firefox/3.6.3 - Build ID: 20100423141150 > > When I run the above test in my error console, I get the following output > alerted: > "30,120,255 == 30,120,255" Although, I am using the system default color profile.
Just tested on Windows in Firefox 3.6.3 and it returns the proper results. This is a Mac only bug.
Comment 6•13 years ago
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Reporter, are you still seeing this issue with Firefox 3.6.13 or later in safe mode? If not, please close. These links can help you in your testing. http://support.mozilla.com/kb/Safe+Mode http://support.mozilla.com/kb/Managing+profiles You can also try to reproduce in Firefox 4 Beta 8 or later, there are many improvements in the new version, http://www.mozilla.com/en-US/firefox/all-beta.html
Whiteboard: [CLOSEME 2011-1-30]
Opening in Firefox 4.0 in Safe Mode there was no changes. However, by creating a new profile in the new Firefox, and starting the browser, the output was correct. Checking in the config values, noticed my profile was set to: gfx.color_management.mode = 1;
As gfx.color_management.mode defaults to 2 - closing this issue.
Status: UNCONFIRMED → RESOLVED
Closed: 13 years ago
Resolution: --- → INVALID
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Description
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