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Colours on web page from gimp weird
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unruh
Apr 22, 2013, 1:58:11 AM4/22/13
to
I was posting a page that I had edited in gimp to a web page
www.theory.physics.ubc.ca/soundcards.html
If you look at most of the pictures, the blue is blue. But on the second
picture after the subtitle
Behringer UCA222 Performance
the blue has become a purple.
If I look at that image in gimp or in xv, the blue is blue, but on at
least my web browser (Firefox 16.02) what is supposed to be blue (the
play and record buttons, the left power bar, the second graph from top
on the right side) it looks purple.
The others were edited in xv, but this one in gimp since xv destroyed
the resolution (see the bottom cut off the "Save Spectrum" in the
picture above this one, and the gaps in the top graph).
Why would a png file saved by gimp cause this strange colour change?
(If I save that image and view it in gimp, in xv, in ee, the colour is
blue, but in the browser it is not.)
www.theory.physics.ubc.ca/soundcards.html
If you look at most of the pictures, the blue is blue. But on the second
picture after the subtitle
Behringer UCA222 Performance
the blue has become a purple.
If I look at that image in gimp or in xv, the blue is blue, but on at
least my web browser (Firefox 16.02) what is supposed to be blue (the
play and record buttons, the left power bar, the second graph from top
on the right side) it looks purple.
The others were edited in xv, but this one in gimp since xv destroyed
the resolution (see the bottom cut off the "Save Spectrum" in the
picture above this one, and the gaps in the top graph).
Why would a png file saved by gimp cause this strange colour change?
(If I save that image and view it in gimp, in xv, in ee, the colour is
blue, but in the browser it is not.)
unruh
Apr 23, 2013, 12:09:41 PM4/23/13
to
On 2013-04-22, unruh <un...@invalid.ca> wrote:
> I was posting a page that I had edited in gimp to a web page
> www.theory.physics.ubc.ca/soundcards.html
>
> If you look at most of the pictures, the blue is blue. But on the second
> picture after the subtitle
> Behringer UCA222 Performance
> the blue has become a purple.
> If I look at that image in gimp or in xv, the blue is blue, but on at
> least my web browser (Firefox 16.02) what is supposed to be blue (the
> play and record buttons, the left power bar, the second graph from top
> on the right side) it looks purple.
On further tests, the above seems to be limited to Firefox. Both
> I was posting a page that I had edited in gimp to a web page
> www.theory.physics.ubc.ca/soundcards.html
>
> If you look at most of the pictures, the blue is blue. But on the second
> picture after the subtitle
> Behringer UCA222 Performance
> the blue has become a purple.
> If I look at that image in gimp or in xv, the blue is blue, but on at
> least my web browser (Firefox 16.02) what is supposed to be blue (the
> play and record buttons, the left power bar, the second graph from top
> on the right side) it looks purple.
Konqueror and Opera see the blue as blue (and for all I know, other
versions of Firefox do as well, but I have tested with at least two.)
What I find puzzling is how a png file made by gimp can be
misinterpreted in its colours by anything, Firefox included. The other
files were screen images made by ksnapshot, and cropped by xv. That one
was made by ksnapshot and cropped by gimp.
Note that there is also something strange in the xv cropped ones, in
that the resolution seems to be changed by xv. Note that the lines in
the graphs (esp the top graph) are broken. That was NOT in the original.
It was introduced by xv.
So, how can gimp produce a png file such that its colours could be
misinterpreted by Firefox?
chris
Apr 24, 2013, 3:35:27 AM4/24/13
to
"unruh" wrote
The requested URL /soundcards.html was not found on this server.
can't help you
>I was posting a page that I had edited in gimp to a web page
> www.theory.physics.ubc.ca/soundcards.html
>
Not Found
> www.theory.physics.ubc.ca/soundcards.html
>
The requested URL /soundcards.html was not found on this server.
can't help you
unruh
Apr 24, 2013, 2:09:50 PM4/24/13
to
Further info-- I tried it on some other versions of firefox where it
displays the colours properly, so it is getting weirder, but also less
interesting. I still wonder how in the world my particular version of
firefox can take an png file and render the colours differently from the
way in which other programs do, and only for a file created by gimp.
But it is retreating from a bug in gimp, to a peculiarity in one
particular version of firefox interacting with something different about
the png file created by gimp.
>
>
>
> can't help you
>
>
>
>
Fr@nk Stef@ni
Apr 25, 2013, 5:37:13 AM4/25/13
to
Am 22.04.2013 07:58, schrieb unruh:
> I was posting a page that I had edited in gimp to a web page
> www.theory.physics.ubc.ca/soundcards.html
>
> If you look at most of the pictures, the blue is blue. But on the second
> picture after the subtitle Behringer UCA222 Performance the blue has
>become a purple.
Here in Firefox-20.0 @ Ubuntu(Linux) everything
> I was posting a page that I had edited in gimp to a web page
> www.theory.physics.ubc.ca/soundcards.html
>
> If you look at most of the pictures, the blue is blue. But on the second
> picture after the subtitle Behringer UCA222 Performance the blue has
>become a purple.
looks correct, no color shift, all images have
the exakt same set of colors in use.
You may check which (if so) color profile the image
is attached or converted to on Gimp export.
I checked the first four images with
exiftool imagename.png
and found that "uca222-.96.png" shows the information
Color Mode: RGB with Alpha
while the other images only show
Color Mode: RGB
which might or might not affect the described behaviour.
Also, you may want to check transparency and color management
settings of all the software you used. In particular, Firefox
is one (if not the only) browser which is capable to mangage
colors correctly (ICC color profiles, search for: "gfx.color"
in Firefox's "about:config" configuration page.)
HTH,
Frank
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