1574049 - PNG lib change colors

Status: NEW

(Core :: Graphics: Color Management, defect, P3)

Description

[Jimy]

Attachment: content_12345.jpg

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps to reproduce:

compare 2 PNG and JPG images, the "bright" 5 on the black background is missing

color: #040404

original PNG:
https://geekbrains-uploads.s3.amazonaws.com/geekbrains/public/ckeditor_assets/pictures/1798/content_12345.png

attach converted JPG

Actual results:

the "bright" 5 on the black background is missing

Expected results:

"light" 5 on a black background is present

Comment 1

[Jimy]

Attachment: PNG_bug.jpg

Comment 2

[Pablo]

Hi,

I tried to replicate this with the provided link as an example but i can´t see the #5 on the black background.
I tried not only firefox, i also tried on Chrome and Opera and i can´t see the number5 on the black background.

Do you have any other example for me to check?

Also please download Firefox Nightly from here: https://nightly.mozilla.org/ and retest the problem.

If you still have the issue please create a new profile, you have the steps here:https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles?redirectlocale=en-US&redirectslug=Managing-profiles#w_starting-the-profile-manager

Lastly test if the issue is reproducible in safe mode, here is a link that can help you:
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Regards
Pablo

Comment 3

[Jimy]

Attachment: FirefoxPNG.jpg

Compare Firefox Nightly, Google Chrome, IE 11

Comment 4

[Jimy]

perhaps this problem is affected by the fact that the driver is twisted gamma or color profile for the monitor

Comment 5

[Jimy]

#5 do not need to see, you can find the "Eyedropper Tool" or "Magic Wand Tool" in photoshop

Comment 6

[Pablo]

I tested the issue using the link provided:
https://geekbrains-uploads.s3.amazonaws.com/geekbrains/public/ckeditor_assets/pictures/1798/content_12345.png

Tested On windows10 64bit + Ubunu 18.02 64bit + MacOs 10.14
Using all current firefox versions:
Firefox Nightly 70.0a1
Firefox Beta 69.0b15
Firefox Release 68.0.2

I was able to replicate the problem on all versions

The #4 on black background is not visible using firefox.
I do see the #4 on black background when using other browsers on windows10.

Comment 7

[Sotaro Ikeda [:sotaro]]

:aosmond, can you comment to the bug?

Comment 8

[Jimy]

Attachment: content_12345_original.png

added the original file so as not to get lost

Comment 9

[Andrew Osmond [:aosmond] (he/him)]

If I disable color management, I can see the 4. This is not a regression (or at least not one in the last 5 years...). The PNG has cHRM and gAMA chunks. Presumably this is a bug in our ICCv2 implementation; we do see oversaturation on Macs, I wonder if it is related.