[Webkit-unassigned] [Bug 92567] New: Images displayed with wrong colours

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=92567

           Summary: Images displayed with wrong colours
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://www.gingerbeardman.com/webkit/image-color-quirk
                    .html
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: matt.sephton at gmail.com


Created an attachment (id=155101)
 --> (https://bugs.webkit.org/attachment.cgi?id=155101&action=review)
output of pnginfo command for the images concerned

Background:
I've been working on a website that requires some images of  solid colour with words cut or punched out. The letter forms are transparent, so what is behind will show through.
They are saved as PNG with an alpha channel.

Image Saving:
I have been very careful to create these images with no color profile or extra information in. So the images are good in that respect.

List of images:
1: contains the word "HOSIERY"
2: the first image above cropped and re-saved with extra chunks removed
3: the first image above cropped and re-saved with extra chunks (Adobe data) intact
4: contains the word "BODY"
5: contains the word "Form"

Expected results:
these images should all be "invisible" on the background colour of the page, as they are the same colour. 

Actual results:
Most of them are visible

Testing:
I am running 10.8.0 Mountain Lion (12A269)

Safari 6.0 (8536.25): image 1 is displayed as expected, images 2-5 are not displayed as expected and are visible
WebKit Nightly 6.0 (8536.25): image 1 is displayed as expected, images 2-5 are not displayed as expected and are visible
Chrome 20.0.1132.57: images 1-4 are displayed as expected, image 5 is not displayed as expected and is visible

Attached is the output of the pnginfo command for the files

Regression:
Pretty sure it wasn't like this on Safari 10.7 Lion, but sadly I cannot check as I no longer have a Lion installation.

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