Firefox pixelated pictures

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Firefox pixelated pictures

Postby marouane87 on Mon Jun 23, 2014 7:34 am

Hello!

Recetly, I've strated experienceing some issues with Firefox dsplaying pictures since they are pixelated. I've cleared the cache and it worked fine. But now, even clearing the cache does not solve the problem.
Anyone knows about this issue please?
(I'm using LM 17 64bit Cinnamon and Firefox 30)

Thank you!
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Re: Firefox pixelated pictures

Postby xenopeek on Mon Jun 23, 2014 12:54 pm

Can you add a screenshot + link to the page you took the screenshot of?

Upload the screenshot to a image host, like http://imgur.com
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Re: Firefox pixelated pictures

Postby marouane87 on Mon Jun 23, 2014 4:14 pm

Thank you very much for your answer. Here is a link: http://imgur.com/JWI87PK
And the website: http://www.commitstrip.com/en/
It's just an example...
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Re: Firefox pixelated pictures

Postby xenopeek on Mon Jun 23, 2014 4:34 pm

I can't really explain it, but I've combined your screenshot with one I took and indeed I see a clear difference: http://i.imgur.com/I1s9l1K.png (top half is part of yours--blocky image, bottom half is part of mine--smooth image).

Is your display set at 24 or 32 bit color depth? I doubt this is it, but if it is set at a lower color depth that might cause such an effect.
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Re: Firefox pixelated pictures

Postby marouane87 on Mon Jun 23, 2014 4:46 pm

I didn't change any color related settings. But how can I know what is the color depth am I using right now please :) ?
Thanks!
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Re: Firefox pixelated pictures

Postby xenopeek on Tue Jun 24, 2014 1:00 am

I'm not sure how else to do it, but this command works for me:
Code: Select all
xwininfo -root | grep Depth

It may tell you that you need to install a package first to get the xwininfo command.
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Re: Firefox pixelated pictures

Postby marouane87 on Tue Jun 24, 2014 2:27 am

At my surprise, depth is set to 24 bit... Any possible way to set it to 32 please? (I'm using Fglrx and didn't find any option in catalyst for that, unless I'm missing something)

Thank you!
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Re: Firefox pixelated pictures

Postby xenopeek on Tue Jun 24, 2014 3:06 am

Mine is set at 24 also, and that is fine. That shouldn't be causing the issue. Can you try with a different browser? Like Chromium. Perhaps there is something in your browser settings that affects JPEG display quality for some reason.
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Re: Firefox pixelated pictures

Postby marouane87 on Tue Jun 24, 2014 7:30 am

I've just installed Chromium and it also has the same problem :? ...
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Re: Firefox pixelated pictures

Postby xenopeek on Tue Jun 24, 2014 8:47 am

Hm. And if you type this command in a terminal:
Code: Select all
wget http://www.commitstrip.com/wp-content/uploads/2014/06/Strip-R%C3%A9mi-Parmentier-650-finalenglish.jpg

That downloads the file Strip-Rémi-Parmentier-650-finalenglish.jpg directly to your home folder. Open it with Image Viewer or GIMP, see if zoomed to 100% that looks any better. This completely avoids using your browser.
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Re: Firefox pixelated pictures

Postby Flemur on Tue Jun 24, 2014 10:16 am

FWIW, with FF 24, I see the xenopeek image, with 24 bit display (32bit display = 24 bits + 8 bits transparency, so they should look the same).

The bad image looks like a low-quality (high compression) jpg image. If the downloaded image looks bad in gimp/whatever, try converting it to png or bmp and see what that looks like. If it's also happening with Chromium, perhaps reinstall the jpg rendering libs....but I'm not sure which those are.

Are you using proprietary display drivers or nouveau?
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Re: Firefox pixelated pictures

Postby marouane87 on Tue Jun 24, 2014 1:20 pm

After downloading the picture, it doesn't look any better... Even after exporting it to png...

I'm using a proprietary driver for ATI: fglrx (the one available at Driver Manager)
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Re: Firefox pixelated pictures

Postby DrHu on Tue Jun 24, 2014 1:40 pm

You could decide on the color depth and whether or not it makes much if any difference to the image display..
https://en.wikipedia.org/wiki/Color_dep ... 824-bit.29
    As of 2012 many modern desktop systems (Mac OS X, GNOME, KDE, Windows XP/Vista/7, etc...) offer an option for 24-bit truecolor with 8 bits for an alpha channel, which is referred to as "32-bit color" or the RGBA color space. Switching to an 8/16/24-bit color option in those systems generally disables transparency/translucency effects, and the only reduction in color depth is seen when going to 8/16-bit color.

And do image programs, such as Gimp show those images as also bad in viewing..
--I might check the image on a graphics program, some of which you will have installed as defaults: GThumb for example.
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Re: Firefox pixelated pictures

Postby marouane87 on Tue Jun 24, 2014 3:48 pm

Yes, the graphic programs shows it the same bad way when I've doanloaded it like xenopeek showed me...
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Re: Firefox pixelated pictures

Postby marouane87 on Fri Jun 27, 2014 7:06 pm

Even after changing the graphic card driver, the problem did not disappear fror Firefox nor Chromium... I'm not sure what the real problem is anymore... A software related one or more general problem...
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