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From Jeremias Maerki <...@jeremias-maerki.ch>
Subject Re: FOP 1.0 TIFF Image Black Pages and Poor Image Quality
Date Thu, 07 Oct 2010 08:36:54 GMT
I've produced the attached TIFF image with FOP Trunk (pretty much
equivalent to FOP 1.0) with practically the same configuration as you,
except for the <transparent-page-background>true</transparent-page-background>
which you should remove.

If by poor quality you mean the bi-level rendering by using a lightness threshold,
that could be improved by rendering the bitmap internally in gray scales
and then rasterize it using Bayer or error-diffusion rastering. We have
code for that but it's not tied into the bitmap renderers and it would
also cost a lot of performance and allow much poorer compression levels.

Maybe you should post an image to demonstrate what you consider poor
quality.

On 05.10.2010 00:25:27 paulnnosh wrote:
> 
> To add some additional information. I have now downgraded to 0.95 and while
> the black pages have gone the image quality is still very bad. I noticed
> that the log output states:
> 
> 04-Oct-2010 21:30:56 org.apache.fop.render.java2d.Java2DRenderer
> getPageImage
> INFO: Rendering Page 1 (pageWidth 595, pageHeight 842)
> 
> Which if I'm not mistaken is only 72dpi for an A4 page. I have set the
> target-resolution to 200dpi so I don't understand why the image is so bad.
> 
> Thanks again...
> 
> 
> paulnnosh wrote:
> > 
> > Hi,
> > 
> > I'm using FOP 1.0 with Java 1.4 (I know, I know! I'm stuck with it for
> > now). 
> > 
> > I'm using FOP to convert XML into a CCITT T.6 compressed TIFF.
> > 
> > With the config file below the output TIFF files are just coloured black.
> > 
> > I can remove the transparent-page-background tag and that produces an
> > image but the quality is very very poor. 
> > 
> > I have Imageio version 1.1 on my classpath. 
> > 
> > My config is as follows:
> > 
> > <fop version="1.0">
> >     <source-resolution>72</source-resolution>
> >     <target-resolution>200</target-resolution>
> >     <renderers>
> >         <renderer mime="image/tiff">
> >   <transparent-page-background>true</transparent-page-background>
> >   <compression>CCITT T.6</compression>
> > </renderer>
> >     </renderers>
> > </fop>
> > 
> > Can anyone shed any light on what the problem is here please? Any help
> > much appreciated.
> > 
> > Many Thanks
> > 
> 
> -- 
> View this message in context: http://old.nabble.com/FOP-1.0-TIFF-Image-Black-Pages-and-Poor-Image-Quality-tp29881437p29882800.html
> Sent from the FOP - Users mailing list archive at Nabble.com.
> 



Jeremias Maerki

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