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[Bug 8960] New: Mozilla logo encoded as JPEG YRbCrK, not RGB

From: <bugzilla@wiggum.w3.org>
Date: Fri, 12 Feb 2010 15:53:05 +0000
To: www-validator-cvs@w3.org
Message-ID: <bug-8960-169@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=8960

           Summary: Mozilla logo encoded as JPEG YRbCrK, not RGB
           Product: Validator
           Version: HEAD
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: trivial
          Priority: P5
         Component: Website
        AssignedTo: dave.null@w3.org
        ReportedBy: roam@ringlet.net
         QAContact: www-validator-cvs@w3.org


Hi,

First of all, thanks a lot for all the services you've been providing to the
Internet community at large for the past... I'm not even sure how many years! 
I've been using the validators for almost ten years now, and plan to keep using
them for a lot longer, and I don't even know how to thank you for all the
standards processes you've got going :)

Now, this bug is not about the validator per se, but about the moz_logo.jpg
file used in several places on various *.w3c.org websites.  This JPEG file, it
seems, has been encoded in a YRbCrK color space, not the usual RGB one, and
some browsers have lots of trouble displaying it.  This was first called to my
attention by a friend (CC'd), who wondered why IE 7 and IE 8 on Windows did not
show this logo; and right now, as I'm writing this report, it turns out that
Firefox 2.x on FreeBSD doesn't, either (which makes me wonder a little, this
shouldn't really happen, but that's a separate FreeBSD-specific problem on my
end :)

When I downloaded the image, converted it to PNM using netpbm's jpegtonpm
program, and converted it back to JPEG using pnmtojpeg (again from netpbm), the
result - http://things.ringlet.net/roam/misc/mozl.jpg - displays in all the
affected browsers we've tested so far, apparently because jpegtopnm groks
YCbRkK and pnmtojpeg silently creates an RGB JPEG file.  So it ought to be
simple to fix this - or you could even use the above-referenced mozl.jpg file
as a quick bandaid :)

It turns out that this is not an isolated incident - a Google search for "YCbCr
Internet Explorer" found at least one page -
http://forums.oscommerce.com/topic/353800-how-to-ensure-your-images-have-valid-filenames/
- that seems to reprot the same conclusion - IE only able to display
RGB-encoded JPEG files.

Once again, thanks a lot for all your web-related work, and sorry for wasting
your time on such a trivial matter :)


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Received on Friday, 12 February 2010 15:53:07 UTC

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