601932 - Invalid PNG rendering

Status: RESOLVED INCOMPLETE

(Core :: Graphics: ImageLib, defect)

Description

[Prakhar Birla]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8

Color shift while rendering PNG image.

Original image color: #373634
Firefox rendered color: #33322e
IE rendered color: #373634

Reproducible: Always

Steps to Reproduce:
URL: http://2011.incident.in/images/big-frame/template/big-frame.png
1. Open the url in Firefox. (no need for HTML/CSS just open the image itself)
2. Save a screen shot.
3. Save the image to disk.
4. Open an Image Color picker to compare rendered colors.
(I used PS-CS5)
Actual Results:  
Firefox rendered color: #33322e

Expected Results:  
Original image color: #373634

Comment 1

[Prakhar Birla]

Attachment: PNG Image with problems.

Comment 2

[Kevin Brosnan]

Works for me - Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.10) Gecko/20100914 Firefox/3.6.10

Both opening the file in Photoshop CS5 and using the Colorzilla extension showed the outside color to be #373634.

Comment 3

[Glenn Randers-Pehrson]

According to "pngcheck", and examination of the ICC profile stored in it, the posted PNG image contains an iCCP chunk that contains the HP sRGB profile, and a cHRM chunk that contains the correct chromaticity values for the sRGB colorspace.  It doesn't have a gAMA chunk.

$ pngcheck -v png-bad-color.png
File: png-bad-color.png (4967 bytes)
  chunk IHDR at offset 0x0000c, length 13
    583 x 232 image, 32-bit RGB+alpha, non-interlaced
  chunk pHYs at offset 0x00025, length 9: 2835x2835 pixels/meter (72 dpi)
  chunk iCCP at offset 0x0003a, length 2639
    profile name = Photoshop ICC profile, compression method = 0 (deflate)
    compressed profile = 2616 bytes
  chunk cHRM at offset 0x00a95, length 32
    White x = 0.31269 y = 0.32899,  Red x = 0.63999 y = 0.33001
    Green x = 0.3 y = 0.6,  Blue x = 0.15 y = 0.05999
  chunk IDAT at offset 0x00ac1, length 2194
    zlib: deflated, 32K window, maximum compression
  chunk IEND at offset 0x0135f, length 0

When the iCCP chunk is present, Firefox ignores the cHRM
chunk and gAMA chunks if they are present, and uses the
iCCP chunk data, if the configuration setting gfx.color_management
is nonzero.

Comment 4

[Prakhar Birla]

Update: After @Kevin pointed out that it works for him, I tried using other Firefox installations but there was no problem on any other install.

@Glenn: I think the problem is rather in my computer / gfX card and Firefox. As I pointed out the same image renders fine on all IE and Firefox except Firefox on my comp. IE also does fine. Please advice.

Comment 5

[Glenn Randers-Pehrson]

@Prakar, have a look at your display profile, identified in "about:config"
gfx.color_management.display_profile.  You can set gfx.color_management_mode to zero to obtain IE behavior (ie., no color management except for incorrectly handling the gAMA chunk)