* Re: Strange Font problem
2010-06-16 1:19 ` Khaled Hosny
@ 2010-06-16 5:46 ` Aditya Mahajan
2010-06-16 5:49 ` Taco Hoekwater
2010-06-16 8:09 ` Hans Hagen
2010-06-16 12:27 ` Andreas Schneider
2 siblings, 1 reply; 8+ messages in thread
From: Aditya Mahajan @ 2010-06-16 5:46 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Wed, 16 Jun 2010, Khaled Hosny wrote:
> On Wed, Jun 16, 2010 at 02:32:48AM +0200, Andreas Schneider wrote:
>> Hello,
>>
>> since one of the last betas (I guess two weeks ago), a strange problem
>> appears in my current document. The first ~10 page are completely fine (i.e.
>> as usual) but the following ~20 pages have some kind of a font problem. The
>> font looks bolder/grainy when zooming out in Acrobat and also the scrolling
>> is pretty slow. After these pages, it's fine again. I don't see any specific
>> trigger, there's nothing "special" on these pages.
>
> Can you check with other PDF readers, it looks like a reader issue to
> me. I've got some strange color issues with ConTeXt generated PDFs and
> Adobe's reader in the past, namely any page with images would have the
> colors brighter than other pages, since the print was fine (and I don't
> use Adobe's for screen reading, I didn't bother). Yours might be
> something similar.
FWIW, I have noticed similar problems with Adobe reader on linux. Pages
that contained a png image with transparency appeared duller than other
pages. But evince and xpdf display the result correctly.
I don't know if the font effects are related or not.
Aditya
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* Re: Strange Font problem
2010-06-16 5:46 ` Aditya Mahajan
@ 2010-06-16 5:49 ` Taco Hoekwater
2010-06-16 12:39 ` Andreas Schneider
0 siblings, 1 reply; 8+ messages in thread
From: Taco Hoekwater @ 2010-06-16 5:49 UTC (permalink / raw)
To: mailing list for ConTeXt users
Aditya Mahajan wrote:
> On Wed, 16 Jun 2010, Khaled Hosny wrote:
>
>> On Wed, Jun 16, 2010 at 02:32:48AM +0200, Andreas Schneider wrote:
>>> Hello,
>>>
>>> since one of the last betas (I guess two weeks ago), a strange problem
>>> appears in my current document. The first ~10 page are completely
>>> fine (i.e.
>>> as usual) but the following ~20 pages have some kind of a font
>>> problem. The
>>> font looks bolder/grainy when zooming out in Acrobat and also the
>>> scrolling
>>> is pretty slow. After these pages, it's fine again. I don't see any
>>> specific
>>> trigger, there's nothing "special" on these pages.
>>
>> Can you check with other PDF readers, it looks like a reader issue to
>> me. I've got some strange color issues with ConTeXt generated PDFs and
>> Adobe's reader in the past, namely any page with images would have the
>> colors brighter than other pages, since the print was fine (and I don't
>> use Adobe's for screen reading, I didn't bother). Yours might be
>> something similar.
>
> FWIW, I have noticed similar problems with Adobe reader on linux. Pages
> that contained a png image with transparency appeared duller than other
> pages. But evince and xpdf display the result correctly.
This happens because on pages with transparency AR switches to a
different color model, and the resulting color conversions are not
producing the same results as conversion to the default (sRGB, I guess)
color model. It is annoying but unlikely to get fixed as this problem
has been around for ages, and more importantly: Adobe is not convinced
this is an actual bug.
It could be the same problem Andreas reported, but it is hard to say
for sure without looking at Andreas' actual PDF.
Best wishes,
Taco
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Strange Font problem
2010-06-16 5:49 ` Taco Hoekwater
@ 2010-06-16 12:39 ` Andreas Schneider
0 siblings, 0 replies; 8+ messages in thread
From: Andreas Schneider @ 2010-06-16 12:39 UTC (permalink / raw)
To: ntg-context
Taco Hoekwater wrote:
> This happens because on pages with transparency AR switches to a
> different color model, and the resulting color conversions are not
> producing the same results as conversion to the default (sRGB, I guess)
> color model. It is annoying but unlikely to get fixed as this problem
> has been around for ages, and more importantly: Adobe is not convinced
> this is an actual bug.
>
> It could be the same problem Andreas reported, but it is hard to say
> for sure without looking at Andreas' actual PDF.
>
> Best wishes,
> Taco
It seems indeed to be a problem with Acrobat, and not (directly) ConTeXt. As
I also wrote in my answer to Khaled, it could be even reproduced on a
different system with an older ConTeXt version.
Of course that doesn't rule out the possibility, that it's triggered by
something ConTeXt does. Since it is my diploma thesis I'm working on, I
can't just publish the PDF without consent from my university (which they
probably won't give at that point). If you are interested in taking a closer
look at that problem, I could send you the PDF in private. If you aren't (or
simply don't have the time), it's also no problem ... as long as the print
version looks fine, which apparently is the case.
Thank you for your insight :-)
Andreas.
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* Re: Strange Font problem
2010-06-16 1:19 ` Khaled Hosny
2010-06-16 5:46 ` Aditya Mahajan
@ 2010-06-16 8:09 ` Hans Hagen
2010-06-17 18:37 ` Khaled Hosny
2010-06-16 12:27 ` Andreas Schneider
2 siblings, 1 reply; 8+ messages in thread
From: Hans Hagen @ 2010-06-16 8:09 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 16-6-2010 3:19, Khaled Hosny wrote:
> On Wed, Jun 16, 2010 at 02:32:48AM +0200, Andreas Schneider wrote:
>> Hello,
>>
>> since one of the last betas (I guess two weeks ago), a strange problem
>> appears in my current document. The first ~10 page are completely fine (i.e.
>> as usual) but the following ~20 pages have some kind of a font problem. The
>> font looks bolder/grainy when zooming out in Acrobat and also the scrolling
>> is pretty slow. After these pages, it's fine again. I don't see any specific
>> trigger, there's nothing "special" on these pages.
>
> Can you check with other PDF readers, it looks like a reader issue to
> me. I've got some strange color issues with ConTeXt generated PDFs and
> Adobe's reader in the past, namely any page with images would have the
> colors brighter than other pages, since the print was fine (and I don't
> use Adobe's for screen reading, I didn't bother). Yours might be
> something similar.
see taco's answer ... what i normally do then is put some invisible
transparent color on the first page of the document as this will trigger
the other color machinery in acrobat
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* Re: Strange Font problem
2010-06-16 8:09 ` Hans Hagen
@ 2010-06-17 18:37 ` Khaled Hosny
0 siblings, 0 replies; 8+ messages in thread
From: Khaled Hosny @ 2010-06-17 18:37 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
On Wed, Jun 16, 2010 at 10:09:11AM +0200, Hans Hagen wrote:
> On 16-6-2010 3:19, Khaled Hosny wrote:
> >On Wed, Jun 16, 2010 at 02:32:48AM +0200, Andreas Schneider wrote:
> >>Hello,
> >>
> >>since one of the last betas (I guess two weeks ago), a strange problem
> >>appears in my current document. The first ~10 page are completely fine (i.e.
> >>as usual) but the following ~20 pages have some kind of a font problem. The
> >>font looks bolder/grainy when zooming out in Acrobat and also the scrolling
> >>is pretty slow. After these pages, it's fine again. I don't see any specific
> >>trigger, there's nothing "special" on these pages.
> >
> >Can you check with other PDF readers, it looks like a reader issue to
> >me. I've got some strange color issues with ConTeXt generated PDFs and
> >Adobe's reader in the past, namely any page with images would have the
> >colors brighter than other pages, since the print was fine (and I don't
> >use Adobe's for screen reading, I didn't bother). Yours might be
> >something similar.
>
> see taco's answer ... what i normally do then is put some invisible
> transparent color on the first page of the document as this will
> trigger the other color machinery in acrobat
Interesting, I've to try this once I'm back working on next edition of
that book(let).
--
Khaled Hosny
Arabic localiser and member of Arabeyes.org team
Free font developer
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Strange Font problem
2010-06-16 1:19 ` Khaled Hosny
2010-06-16 5:46 ` Aditya Mahajan
2010-06-16 8:09 ` Hans Hagen
@ 2010-06-16 12:27 ` Andreas Schneider
2 siblings, 0 replies; 8+ messages in thread
From: Andreas Schneider @ 2010-06-16 12:27 UTC (permalink / raw)
To: ntg-context
Khaled Hosny wrote:
> On Wed, Jun 16, 2010 at 02:32:48AM +0200, Andreas Schneider wrote:
>
> Can you check with other PDF readers, it looks like a reader issue to
> me. I've got some strange color issues with ConTeXt generated PDFs and
> Adobe's reader in the past, namely any page with images would have the
> colors brighter than other pages, since the print was fine (and I don't
> use Adobe's for screen reading, I didn't bother). Yours might be
> something similar.
Indeed, it works with XPDF, Okular and Foxit Reader (haven't tried others
yet). That may explain, why I didn't notice the problem earlier. As it
seems, it even happens with older context versions (I now tried 2010.05.13
on a different system) and with older versions of my document of which I was
pretty sure that they looked fine before - apparently I didn't try with
Acrobat or just didn't notice the problem back then.
Thanks for that hint in the right direction!
Best Regards,
Andreas.
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^ permalink raw reply [flat|nested] 8+ messages in thread