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Bug 331781 - low resolution graphic appears smoothed
low resolution graphic appears smoothed
Status: RESOLVED NOTGNOME
Product: evince
Classification: Core
Component: PDF
2.21.x
Other All
: Normal normal
: ---
Assigned To: Evince Maintainers
Evince Maintainers
: 484340 509132 (view as bug list)
Depends on:
Blocks:
 
 
Reported: 2006-02-19 15:06 UTC by Arthur
Modified: 2008-01-13 16:52 UTC
See Also:
GNOME target: ---
GNOME version: ---


Attachments
Additional test case... (99.60 KB, image/x-eps)
2006-06-30 17:41 UTC, petrosyan
Details

Description Arthur 2006-02-19 15:06:20 UTC
Please describe the problem:
I have a graphic showing a low resolution image with graph axes superimposed,
saved as both EPS and PDF. When I view either file with Evince, the graphic
appears smoothed. When I view the PDF with Acroread, I can see the individual
pixels.

I have uploaded three files to demonstrate the problem (the PNG shows the graph
as I want it to appear):

http://www.magres.nottingham.ac.uk/~magill/pixels/pixels.png
http://www.magres.nottingham.ac.uk/~magill/pixels/pixels.pdf
http://www.magres.nottingham.ac.uk/~magill/pixels/pixels.eps

I am using Gentoo Linux, fluxbox, evince 0.5.0, poppler-0.5.0-r5 (cairo)

Steps to reproduce:
1. open pixels.eps
2. open pixels.pdf
3. compare to pixels.png


Actual results:
The image appears as a smooth gradient.
The PDF shows a white border on the bottom and right edges of the image and
colourbar.

Expected results:
see pixels.png - I expect to see individual pixels in the image, and no white
border on the PDF. The PDF file displays as expected in Acroread. The EPS file
appears correct if displayed with xv.

Does this happen every time?
yes

Other information:
Comment 1 petrosyan 2006-06-30 17:41:26 UTC
Created attachment 68221 [details]
Additional test case...

Hi,

I can confirm similar behavior with evince 0.5.2 on ubuntu and evince 0.5.3 on debian experimental, but only with postscript files in evince and not with pdf (though that might be dependent upon my workflow in producing each).  Example eps is attached to this posting (smoothing behavior apparent in evince 0.5.x and correct behavior in evince < 0.4.x and gv).  Larger canonical source for graphic and paper (in which it is embedded) is available at:

http://arxiv.org/abs/cond-mat/0606014

Please note that this bug is especially CRITICAL for scientific communication, where such smoothing obviously changes the underlying data.

Thank you kindly,
Daniel
Comment 2 petrosyan 2006-07-02 16:10:52 UTC
This bug is still present in evince-0.5.3 using poppler 0.5.3 (cairo).
Comment 3 petrosyan 2006-10-31 17:14:06 UTC
This bug is still present in Evince 0.6.0
I want to emphasize here that because of this bug, evince cannot be used for reading scientific papers. It changes the underlying data, sometimes quite significantly. No self respecting scientist can afford to read pdf papers in a viewer that significantly modifies the figures. Adobe Reader 7 does not have this bug, and that's what we are forced to use on Linux, to view pdf files.

Arthur, please update the version of this bug report to 0.6 and raise the severity to "Major".
Comment 4 petrosyan 2006-10-31 17:17:13 UTC
To demonstrate the graveness of this bug please look at Fig. 3 in this pdf paper:
http://arxiv.org/pdf/cond-mat/0606014

in evince and in Acrobat Reader. You can see that the data looks very different.
Comment 5 Arthur 2006-10-31 18:08:57 UTC
I can confirm I'm still seeing the same problem with Evince 0.6.0 and Poppler 0.5.4 (Cairo), both using the standard Gentoo packages.

I work in MRI so this bug is a showstopper for me too, but I don't think it really counts as a major bug for most users. It would be nice if one of you Gnome folks would confirm it though...
Comment 6 Carlos Garcia Campos 2007-01-14 16:41:13 UTC
hmm, this looks like a poppler or cairo issue, no?
Comment 7 Arthur 2007-01-14 16:58:53 UTC
I'd say that's a fair guess, but I don't know which one, hence reported under Evince hoping someone with more knowledge would point the report in the right direction. The end result is still that Evince is unusable for me.
Comment 8 Carlos Garcia Campos 2007-02-03 11:24:55 UTC
I've just forwarded this to poppler (https://bugs.freedesktop.org/show_bug.cgi?id=9860). 
Thanks Arthur, I hope it will be fixed soon. 
Comment 9 Arthur 2007-02-03 16:34:40 UTC
Thanks for checking this out Carlos. Keep up the good work with Evince. Let's hope Poppler sort this out soon and I can go back to using Evince.
Comment 10 Carlos Garcia Campos 2007-10-07 10:41:55 UTC
*** Bug 484340 has been marked as a duplicate of this bug. ***
Comment 11 Carlos Garcia Campos 2008-01-13 16:25:28 UTC
*** Bug 509132 has been marked as a duplicate of this bug. ***
Comment 12 petrosyan 2008-01-13 16:35:23 UTC
I can reproduce this bug in evince 2.20.2 using poppler 0.6.2 (cairo), please update the version field of this bug.
Comment 13 bugreports 2008-01-13 16:51:19 UTC
it is even in evince 2.21.1 and poppler 0.6.3 (cairo)