bad quality images in PDF

Hi all,

I'm new to Tex...  I'm writing my thesis and I need to insert images.

At first, I got the original snaphots in jpg format, then I converted
them in .eps with the jpeg2ps utility, and I inserted in my document
using

 \includegraphics[width=13cm]{immagini/architecture_overview.eps}

It's OK, the images are correctly put and shown in to my DVI document.

When I convert my DVI file into PDF format (the final document must be
in PDF format),
the images look so bad (there is a great loss of quality).

How can I insert images without losing quality in the final PDF? What
is the best starting format to use (in my case is jpg, but I can choose
another one if needed), what is the utility I can use to convert them e
what is the TeX code to insert them ? I need some special packages?

thank you all!

mv

0
4/24/2006 10:45:52 AM
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If you use pdfLaTeX rathern than LaTeX, you can use your original jpgs, and
eliminate the middle step of dvi->pdf.


0
s4076855 (3)
4/24/2006 11:05:50 AM
"maiVassallo" <matteo.formica@gmail.com> wrote:

> At first, I got the original snaphots in jpg format, then I converted
> them in .eps with the jpeg2ps utility, and I inserted in my document
> using

JPEG is not the best format for screen shots. Better is a lossless
format such as PNG.

>  \includegraphics[width=13cm]{immagini/architecture_overview.eps}

PNG can be used directly with pdfTeX or TeX/dvipdfm/ebb, otherwise
it can be converted to EPS.

> When I convert my DVI file into PDF format (the final document must be
> in PDF format),
> the images look so bad (there is a great loss of quality).

dvips just copies the EPS file, ps2pdf in its default setting (see
ghostscript's docu Ps2pdf.htm) does not downsample the image.
The problem is rather the poor resolution of the original
screen shot. Try to improve this resolution (larger window with larger
screen font size, ...). Also you can play with AR's options. Perhaps
there is some setting that looks better.

> How can I insert images without losing quality in the final PDF?

Don't use JPEG.

Yours sincerely
  Heiko <oberdiek@uni-freiburg.de>
0
oberdiek (2376)
4/24/2006 11:23:14 AM
and how can I include the jpg images in my code?

I try to iclude a jpeg file:

\includegraphics[width=13cm]{immagini/architecture_overview.jpg}

and I get some errors

File 'immagini/architecture_overview.bb' not found

and

Cannote determine size of graphic in immagini/architecture_overview.bb
(no boundingBox)

what do I have to do?

0
4/24/2006 11:31:24 AM
maiVassallo wrote:
> and how can I include the jpg images in my code?
> 
> I try to iclude a jpeg file:
> 
> \includegraphics[width=13cm]{immagini/architecture_overview.jpg}
> 
> and I get some errors
> 
> File 'immagini/architecture_overview.bb' not found
> 
> and
> 
> Cannote determine size of graphic in immagini/architecture_overview.bb
> (no boundingBox)
> 
> what do I have to do?
> 

run pdflatex not latex

and remove the 'dvipdfm' option from graohicx

-- 

/daleif (remove RTFSIGNATURE from email address)

LaTeX FAQ:      http://www.tex.ac.uk/faq
Superb Class:   http://www.ctan.org/tex-archive/help/Catalogue/entries/memoir.html
LaTeX book:     http://www.imf.au.dk/system/latex/bog/    (in Danish)
Remember to post minimal working examples.
0
daleif2 (2648)
4/24/2006 11:51:47 AM
Lars Madsen wrote:
> maiVassallo wrote:
> 
>> and how can I include the jpg images in my code?
>>
>> I try to iclude a jpeg file:
>>
>> \includegraphics[width=13cm]{immagini/architecture_overview.jpg}
>>
>> and I get some errors
>>
>> File 'immagini/architecture_overview.bb' not found
>>
>> and
>>
>> Cannote determine size of graphic in immagini/architecture_overview.bb
>> (no boundingBox)
>>
>> what do I have to do?
>>
> 
> run pdflatex not latex
> 
> and remove the 'dvipdfm' option from graohicx
> 

should have been graphicx

-- 

/daleif (remove RTFSIGNATURE from email address)

LaTeX FAQ:      http://www.tex.ac.uk/faq
Superb Class:   http://www.ctan.org/tex-archive/help/Catalogue/entries/memoir.html
LaTeX book:     http://www.imf.au.dk/system/latex/bog/    (in Danish)
Remember to post minimal working examples.
0
daleif2 (2648)
4/24/2006 11:52:08 AM
> dvips just copies the EPS file, ps2pdf in its default setting (see
> ghostscript's docu Ps2pdf.htm) does not downsample the image.
> The problem is rather the poor resolution of the original
> screen shot. Try to improve this resolution (larger window with larger
> screen font size, ...). Also you can play with AR's options. Perhaps
> there is some setting that looks better.

As far as I can tell, this is only partially true.  While downsampling 
of the image is not done by default, ps2pdf _does_ compress bitmap 
images by default.  It looks like this behavior has been modified in 
more recent versions of ps2pdf:

(From Ps2pdf.htm in Debian Sarge:)
(note 1) AutoFilterxxxImages doesn't examine the image to decide between 
JPEG and LZW or Flate compression: it uses JPEG compression if the image 
has 8 bits per component and does not use an Indexed color space, and 
LZW or Flate compression otherwise.

(From Ps2pdf.htm in Debian Unstable:)
(note 1) Currently, AutoFilterxxxImages doesn't examine the image to 
decide between JPEG and LZW or Flate compression: it always uses Flate 
compression. If you want to force JPEG compression, use 
-dAutoFilterxxxImages=false.

It was the old behavior (for example, in Debian Sarge) that always gave 
me problems.  I'd feed a nice clean bitmap into ps2pdf, and it would 
always come up with JPEG compression artifacts.  I'm glad the default 
behavior has been changed, but if the original poster is using an older 
version of ps2pdf, then the old default behavior may be the cause of the 
problems (or course using jpg images for screen shots can never help). 
I usually use ps2pdf with the options given below to fix this problem on 
older distributions.

ps2pdf -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode

Scott Thatcher
0
thatcher (28)
4/24/2006 2:16:53 PM
Heiko Oberdiek schrieb:

> PNG can be used directly with pdfTeX or TeX/dvipdfm/ebb, otherwise
> it can be converted to EPS.

To use PNGs with pdflatex one can run

png2pdf -p 1.4 -n screenshot.png screenshot.pdf

and use the PDF file in the LaTeX source.
The -n option inserts an interpolation flag to screenshot.pdf,
AR does an image interpolation when showing the image. Sometimes
this improves rendering quality on screen.
See http://png2pdf.sourceforge.net/png2pdf.pdf page 15 for
an example.
Hope this helps.

Dirk

-- 
Dipl.-Ing. Dirk Krause
http://www.fh-schmalkalden.de/url.php?/page/1026/select_wert/3023
Please use the web form in the line above to establish personal contact.
Do not use the e-mail address shown in the header lines, mails to this
address go into the electronic trash can. Thanks.
0
4/25/2006 7:51:23 AM
maiVassallo wrote:

> At first, I got the original snaphots in jpg format, then I converted them
> in .eps with the jpeg2ps utility, and I inserted in my document using
[..]
> When I convert my DVI file into PDF format (the final document must be in
> PDF format), the images look so bad (there is a great loss of quality).

Try to use higher resolution in the conversion .jpg -> .eps, e.g. using
ImageMagick's convert.

Andres Kuusk
Tartu Observatory, Estonia

0
4/26/2006 6:16:05 AM
Dirk Krause wrote:
> Heiko Oberdiek schrieb:
>
> > PNG can be used directly with pdfTeX or TeX/dvipdfm/ebb, otherwise
> > it can be converted to EPS.
>
> To use PNGs with pdflatex one can run
>
> png2pdf -p 1.4 -n screenshot.png screenshot.pdf
>
> and use the PDF file in the LaTeX source.

Why not simply use the PNG in the LaTeX source directly? I can't see
any benefits gained by the conversion to PDF.

Will

0
wspr81 (1209)
4/26/2006 1:55:54 PM
Just use sam2p to convert your raster graphic to EPS/PDF.  I've found
that sam2p does a much better job with the conversion than ImageMagick
or pretty much any other converter.  I think it's so good that I setup
a web interface to perform the conversion:

http://www.tlhiv.org/rast2vec/

Remember if you're using LaTeX, then you need the EPS.  If you're using
PDFLaTeX, you need the PDF version.  If your graphic is foo.jpg (or
foo.png), then the converter will give you a foo.eps and/or foo.pdf.
Within your document use

\usepackage{graphicx}

in the preamble and then

\includegraphics{foo}

in the document.  Notice that the filename extension was not specified.
 This is because LaTeX is smart enough to use .eps and PDFLaTeX is
smart enough to use .pdf without having to specify them.

Troy Henderson
Assistant Professor
Department of Mathematical Sciences
252 Thayer Hall
United States Military Academy
West Point, NY  10996
(845) 938-5649
http://www.tlhiv.org

0
thenders (206)
4/29/2006 1:47:08 PM
Reply:

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