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From Jay Chiu <jayc...@ureach.com>
Subject Re: Re: Problem with scaling png image file in svg
Date Thu, 12 Feb 2004 04:02:59 GMT
Chris and Thomas,

Can you please give me some help? Please tell me which files I
should change to solve the problem.

Thanks a lot.

Jay


============================================

List:       fop-user
Subject:    Re: Re: Problem with scaling png image file in svg
From:       Jay Chiu <jaychiu () ureach ! com>
Date:       2004-02-10 5:13:26

I think changing org.apache.fop.svg.PDFGraphics2D class may
solve the image quality issue. Because PDFGraphics2D class
hangles the image drawing. Can Fop developer please give me
some
help?

I tried to debug through fop with batik and find the call stack
for handling my png image is as following:

(1)org.apache.fop.svg.PDFGraphics2D.drawImage(Image img, int x,
int y,ImageObserver observer)
(2)org.apache.batik.ext.awt.image.GraphicsUtil.drawImag(Graphics2D
g2d, CachableRed cr):152
(3)org.apache.batik.ext.awt.image.GraphicsUtil.drawImag(Graphics2D
g2d, CachableRed cr):439
(4)org.apache.batik.gvt.primitivePaint(Graphics2D g2d):92
(5)org.apache.batik.gv.AbstractGraphicsNode.paint(Graphics2D
g2d):485
(6)org.apache.batik.gvt.CompositeGraphicsNode.primitivePaint(Graphics2D
g2d):130
(7)org.apache.batik.gv.AbstractGraphicsNode.paint(Graphics2D
g2d):485
(8)org.apache.batik.gvt.ImageNode.paint(Graphics2D g2d):34
org.apache.batik.gv.AbstractGraphicsNode.paint(Graphics2D g2d)

>From the call stack info, it is clear that PDFGraphics2D
handles
the actual external image drawing. Can someone change
PDFGraphics2d to use the same approach to handle external image
file as other image handling code in FOP does?

Thanks.

Jay

> ---- On Sat, 07 Feb 2004, Jay Chiu (jaychiu@ureach.com)
wrote:
> 
> Thanks Thomas,
>  
> I guess anyone who includes images in SVG may get the same
> problem. 
> 
> We are delivering a report tool to client and the client is
> complaining about the chart quality in pdf. Thus we are in a
> hurry to solve this isse. 
> 
> If someone has already written some code to solve this issue,
> please forward me some of your code.
> 
> If it is not too difficult, can you please give me some hint
and
> tell me which file should be changed? I guess probably we may
> take some fop's code to solve this issue, becuase the
> subsampling works fine in Fop.
> 
> Thanks a lot.
>  
> Jay
> 
> > ==============================================
> > Subject: Re: Problem with scaling png image file in svg 
> > From: Thomas DeWeese <Thomas.DeWeese@Kodak.com> 
> > Date: Fri, 06 Feb 2004 06:25:45 -0500 
> > To: batik-dev@xml.apache.org 
> > 
> >
>
--------------------------------------------------------------------------------
> > 
> > Jay Chiu wrote:
> > 
> > > I tried with Batik Squiggle for the png images. If I does
> not
> > > use <g transform="scale(xxx)">, the png image looks good
in
> > the
> > > GUI, it does get scaled properly. But image with scale()
> > > transform attribute losses quality, and the png file
> > generated
> > > by Squiggle is in bad quality. 
> > 
> >     The problem is that you are asking to subsample the
image
> > too much.  The large image is reduced by 5x the small by
10x.
> > Batik does not prefilter for large subsample values so you
> > 'loose' pixels with subsample values this high and the
result
> > is aliasing effects.
> > 
> >     If anyone wants to write/contribute a block average or
> > better
> > a true prefiltered resample operation I'm sure it would be
> > appreciated.  I can help with plugging it into Batik in the
> > right spot.
> > 
> > > I am also sending the email to batik-user mail list. Hope
> > Batik
> > > team can also help.
> > > 
> > > Attache please find a svg file , a source png file and
> > > generated
> > > png file.
> > > 
> > > Thanks a lot.
> > > 
> > > Jay
> > > 
> > 
> > 
> > 
> > ________________________________________________
> > Get your own "800" number
> > Voicemail, fax, email, and a lot more
> > http://www.ureach.com/reg/tag
> > 
> > 
> 
> 
> 


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