xmlgraphics-fop-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From paulnnosh <anouska_stre...@hotmail.com>
Subject Re: FOP 1.0 TIFF Image Black Pages and Poor Image Quality
Date Sun, 10 Oct 2010 20:17:28 GMT

Hi,

I have attached a copy of my generated TIFF. Note, if I remove
<transparent-page-background> from my config it makes no difference.

If I set the resolution and compression via the code (via TIFFRenderer),
rather than via a config file the image quality is much improved. I can't
explain this!

Thanks


Jeremias Maerki-2 wrote:
> 
> 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
> 
>  
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: fop-users-unsubscribe@xmlgraphics.apache.org
> For additional commands, e-mail: fop-users-help@xmlgraphics.apache.org
> 
http://old.nabble.com/file/p29929378/C25C%2B-%2Bpoor%2Bquality.tiff
C25C+-+poor+quality.tiff 
-- 
View this message in context: http://old.nabble.com/FOP-1.0-TIFF-Image-Black-Pages-and-Poor-Image-Quality-tp29881437p29929378.html
Sent from the FOP - Users mailing list archive at Nabble.com.


---------------------------------------------------------------------
To unsubscribe, e-mail: fop-users-unsubscribe@xmlgraphics.apache.org
For additional commands, e-mail: fop-users-help@xmlgraphics.apache.org


Mime
View raw message