791456 - Images on xkcd.com are mangled with gfx.color_management.enablev4 set to true

Status: RESOLVED DUPLICATE of bug 722831

(Core :: Graphics: Color Management, defect)

Description

[Emanuel Hoogeveen [:ehoogeveen]]

Attachment: Color profile that shows the problem

Using the attached profile, created using dispcalGUI and my ColorMunki Photo, images on xkcd.com show up mangled in somewhat random ways (the attached png shows the problem). This problem only happens when gfx.color_management.enablev4 is set to true - however I don't know whether the setting is directly responsible, or if this is simply an ICC v4 profile that doesn't get used with gfx.color_management.enablev4 set to false.

Testing was done using today's Nightly (2012-09-15), regression range (if any) unknown.

Expected results:
Image displays correctly (albeit with colors adjusted).

Actual results:
Image displays mangled, horizontally squashed and interspersed with or followed by colored vertical lines.

Comment 1

[Emanuel Hoogeveen [:ehoogeveen]]

Attachment: Image showing a mangled version of the image in the URL

Comment 2

[Emanuel Hoogeveen [:ehoogeveen]]

Oops, I didn't mean to mark the ICC profile as an image/png - that was meant for the second attachment only.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

This may have been caused by bug 791305 which landed yesterday.

Comment 4

[Emanuel Hoogeveen [:ehoogeveen]]

Ah, that's unfortunate timing on my part. I also saw this problem on yesterday's nightly, so I don't believe that bug is responsible.

Comment 5

[Emanuel Hoogeveen [:ehoogeveen]]

I did a little more investigation: gfx.color_management.enablev4 landed in the Nightly for 2011-07-29, and the image from the example URL looks just as broken in that build as it does today. So this isn't a recent regression - it's always been broken with that option enabled.

The attached profile was created using dispcalGUI 1.0.9.0, based on the Argyll CMS 1.4.0 tools, and uses the following options:
Profile type: XYZ LUT + matrix
Black point compensation: Enabled
Testchart file: Massive testchart for LUT profiles

Comment 6

[Emanuel Hoogeveen [:ehoogeveen]]

I also think it has something to do with the profile embedded in the image, as the test page on color.org doesn't show the problem (Image URL: http://imgs.xkcd.com/comics/nanobots.png).

Comment 7

[Emanuel Hoogeveen [:ehoogeveen]]

Attachment: Profile embedded in the image (Dot Gain 20%)

This is the profile as embedded in the png. If I open the image in GIMP, convert it to color (from grayscale) and save it, this data seems to get stripped. If I then convert it back to grayscale, the image displays just fine in Firefox. So the problem must be related to this profile (and my own) in some way.

Comment 9

[Török Edwin]

(In reply to Daniel Veditz [:dveditz] from comment #8)
> 
> *** This bug has been marked as a duplicate of bug 722831 ***

I have just encountered this bug (when enabling v4), and tried to access bug 722831, but it says Access Denied.
What is the status of this bug?