Strange Font problem
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. Sorry that I can't give any more details, but I wasn't able yet to pinpoint the problem. Even producing a long test document using \dorecurse didn't provoke that problem. I made a screenshot of one of the aforementioned spots where it switches - in this case from "wrong" to "right". http://aksdb.homeip.net/ConTeXt_Font.png I guess you can easily see that the font on the upper page (the wrong one) looks different from the page below (the right one). They should be the same and it even looks correct when zooming further in. Both pages are consecutive and there is no code inbetween (no manual break, nothing). Has someone seen something like this before and can give me a hint where to start looking for the trigger so that I can maybe produce a smaller test example to help find and fix the root cause? Thanks in advance, Andreas.
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. -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer
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
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
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.
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 ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
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
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.
participants (5)
-
Aditya Mahajan -
Andreas Schneider -
Hans Hagen -
Khaled Hosny -
Taco Hoekwater