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PNG in Chrome shows a different image than in Safari or any desktop app

lr0.org

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Re: PNG in Chrome shows a different image than in Safari or any desktop app

#2

Post by dcrazy »

Given the Safari team has been the major driving force behind support for wide gamut in web browsers (for the very obvious reason that all Apple devices ship with wide-gamut displays), I am extremely suspicious of the author’s assertion that Safari is ignoring an embedded ICC profile while Chrome and Firefox are doing the right thing.

I think it’s far more likely that whatever chain of open-source image modification tools the author is using has written out pixel values in a different colorspace than the one named in the embedded ICC profile.

But if the author is absolutely confident in their analysis, they are welcome to file a bug report: https://bugs.webkit.org/

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#3

Post by lr0 »

dcrazy wrote: post #2

Given the Safari team has been the major driving force behind support for wide gamut in web browsers (for the very obvious reason that all Apple devices ship with wide-gamut displays), I am extremely suspicious of the author’s assertion that Safari is ignoring an embedded ICC profile while Chrome and Firefox are doing the right thing. I think it’s far more likely that whatever chain of open-source image modification…

You can try. I'm on Safari Version 18.6 (20621.3.11.11.3) [Seqouia 15.6.1] on my Mac, unsure of the version in my iPhone and iPad, but all of them ignore the ICC profile.

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#6

Post by dcrazy »

lr0 wrote: post #3
dcrazy wrote: post #2

Given the Safari team has been the major driving force behind support for wide gamut in web browsers (for the very obvious reason that all Apple devices ship with wide-gamut displays), I am extremely suspicious of the author’s assertion that Safari is ignoring an embedded ICC profile while Chrome and Firefox are doing the right thing. I think it’s far more likely that whatever chain of open-source image modification…

You can try. I'm on Safari Version 18.6 (20621.3.11.11.3) [Seqouia 15.6.1] on my Mac, unsure of the version in my iPhone and iPad, but all of them ignore the ICC profile.

Again, my suspicion is that you are actually seeing the ICC profile being applied correctly, and it is the pixel values in your image that are incorrect.

A good test would be to run a single 100% sRGB red pixel through your image processing pipeline, and then inspecting the resulting PNG file in a hex editor to see what value is encoded.

You can also visit this web page to actively test each web browser’s respect for embedded ICC profiles: https://www.gballard.net/psd/go_live_page_profile/embeddedJP...

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#7

Post by culi »

dcrazy wrote: post #2

Given the Safari team has been the major driving force behind support for wide gamut in web browsers (for the very obvious reason that all Apple devices ship with wide-gamut displays), I am extremely suspicious of the author’s assertion that Safari is ignoring an embedded ICC profile while Chrome and Firefox are doing the right thing. I think it’s far more likely that whatever chain of open-source image modification…

This might be true but I would hope the web standard is defined enough that browsers can also fail in the same way. Regardless of which browser is the most "correct" here

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#8

Post by dylan604 »

culi wrote: post #7
dcrazy wrote: post #2

Given the Safari team has been the major driving force behind support for wide gamut in web browsers (for the very obvious reason that all Apple devices ship with wide-gamut displays), I am extremely suspicious of the author’s assertion that Safari is ignoring an embedded ICC profile while Chrome and Firefox are doing the right thing. I think it’s far more likely that whatever chain of open-source image modification…

This might be true but I would hope the web standard is defined enough that browsers can also fail in the same way. Regardless of which browser is the most "correct" here

"correct" in fail, in the same way across browsers? that's hilarious. I forget that throughout the history of the internet the one thing we've been able to depend on is different browsers behaving the same way

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#9

Post by msla »

Ah, so we're back to koolefant:

https://x42.com/koolefant/

> If you are using Netscape(*) you will probably see the happy cow above. Internet Explorer-users on Windows and Mac, however, will see a dead flat elephant. And this is due to a strange browser-feature.

> (*) or MSIE for Solaris

Yes, Netscape and MSIE on Solaris. This goes back to the 1990s:

https://web.archive.org/web/19990222144857/http://x42.com/ko...

Re: PNG in Chrome shows a different image than in Safari or any desktop app

#10

Post by kaelwd »

garciansmith wrote: post #4

Image looks the same to me in Firefox (Linux) and Falkon as it does in image viewers (Gwenview and GIMP). Which in all cases seems kind of washed out, so I think that's the "smoky," not "normal" image but I'm not sure.

GIMP asks if I want to keep or convert the color profile but both options look washed out. The only thing that opens it "correctly" for me is MPV.
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