problem scaling big png images

problem scaling big png images

[Mojca Miklavec]

Hello,

I have problems with scaling of big png images. Scaling works ok with
XeTeX, but fails with both pdfTeX and LuaTeX, so it might be a problem
in the engine, not necessary in ConTeXt. The image comes out with
several cm white border when it should occupy the whole page.

Here are the testing files (temporary location):
     http://www.mars2008.si/context/

\defineoverlay [MyGraphic] [{\externalfigure[graphic][heigh=\paperheight]}]
\setupbackgrounds[page][background=MyGraphic]
\starttext
whatever
\stoptext

+ a big png graphic. When I decrease resolution, the white border
around graphic shrinks.

Mojca

pdfTeX 3.1415926-1.40.9-2.2 (Web2C 7.5.7)
This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
MtxRun | current version: 2008.11.10 21:40
(same problem on TL)
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Re: problem scaling big png images

[Hans Hagen]

Mojca Miklavec wrote:
> Hello,
> 
> I have problems with scaling of big png images. Scaling works ok with
> XeTeX, but fails with both pdfTeX and LuaTeX, so it might be a problem
> in the engine, not necessary in ConTeXt. The image comes out with
> several cm white border when it should occupy the whole page.
> 
> Here are the testing files (temporary location):
>      http://www.mars2008.si/context/
> 
> \defineoverlay [MyGraphic] [{\externalfigure[graphic][heigh=\paperheight]}]
> \setupbackgrounds[page][background=MyGraphic]
> \starttext
> whatever
> \stoptext
> 
> + a big png graphic. When I decrease resolution, the white border
> around graphic shrinks.
> 
> Mojca
> 
> pdfTeX 3.1415926-1.40.9-2.2 (Web2C 7.5.7)
> This is LuaTeX, Version snapshot-0.30.2-2008102016, build unknown
> MtxRun | current version: 2008.11.10 21:40
> (same problem on TL)

you have a typo:

   [heigh=\paperheight]

   must be: height (add a t)

the three versions are now unscaled:

  3.653.484 luatex.pdf
  3.672.711 pdftex.pdf
  5.498.535 xetex.pdf
  3.654.573 graphic.png

although xetex seem sto do something funny with the image (it's the 
slowest of the three runs so maybe some resampling takes place)

Hans

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If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

Re: problem scaling big png images

[Wolfgang Schuster]

On Thu, Nov 13, 2008 at 1:44 PM, Mojca Miklavec
<mojca.miklavec.lists@gmail.com> wrote:
> Hello,
>
> I have problems with scaling of big png images. Scaling works ok with
> XeTeX, but fails with both pdfTeX and LuaTeX, so it might be a problem
> in the engine, not necessary in ConTeXt. The image comes out with
> several cm white border when it should occupy the whole page.
>
> Here are the testing files (temporary location):
>     http://www.mars2008.si/context/
>
> \defineoverlay [MyGraphic] [{\externalfigure[graphic][heigh=\paperheight]}]
                                                        ^^^^^
                                                        height

You could also write

\defineoverlay[MyGraphic][\overlayfigure{graphic}]

> \setupbackgrounds[page][background=MyGraphic]
> \starttext
> whatever
> \stoptext
>
> + a big png graphic. When I decrease resolution, the white border
> around graphic shrinks.
>
> Mojca

Wolfgang
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___________________________________________________________________________________

Re: problem scaling big png images

[Taco Hoekwater]

Mojca Miklavec wrote:
> Hello,
> 
> I have problems with scaling of big png images. Scaling works ok with
> XeTeX, but fails with both pdfTeX and LuaTeX, so it might be a problem
> in the engine, not necessary in ConTeXt. The image comes out with
> several cm white border when it should occupy the whole page.
> 
> Here are the testing files (temporary location):
>      http://www.mars2008.si/context/
> 
> \defineoverlay [MyGraphic] [{\externalfigure[graphic][heigh=\paperheight]}]
                                                              ^
Missing a 't' here. When I add that, I get a 297mm high by
about 190mm wide image. That seems about right to me ?

Best wishes,
Taco
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___________________________________________________________________________________

Re: problem scaling big png images

[Mojca Miklavec]

On Thu, Nov 13, 2008 at 1:58 PM, Taco Hoekwater wrote:
>
>
> Mojca Miklavec wrote:
>> Hello,
>>
>> I have problems with scaling of big png images. Scaling works ok with
>> XeTeX, but fails with both pdfTeX and LuaTeX, so it might be a problem
>> in the engine, not necessary in ConTeXt. The image comes out with
>> several cm white border when it should occupy the whole page.
>>
>> Here are the testing files (temporary location):
>>      http://www.mars2008.si/context/
>>
>> \defineoverlay [MyGraphic] [{\externalfigure[graphic][heigh=\paperheight]}]
>                                                              ^
> Missing a 't' here. When I add that, I get a 297mm high by
> about 190mm wide image. That seems about right to me ?

I need to get retired from using TeX. Sorry :(

The fact that confused me most is that XeTeX seemed to do it right,
and the previous version of image appeared to be OK as well. But there
the image was oversized anyway. Sorry again.

(TeX bugs strike so often that I tend to forget to double-check my own
mistakes when weird things start happening.)

Mojca
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