Peter Becker wrote:
Hi all,
after someone reported having troubles with my little XWeb program
(http://xweb.sf.net) and rendering SVGs on a 1.4.2 JDK on Linux, I tried
upgrading to Batik 1.5. This seems to fix the problem with empty results
which were reported, but unfortunately the looks of some buttons
rendered for one of my sites (http://tockit.sf.net) change quite a bit.
Since I added the Batik version to XWeb before I figured out that one
should keep track of version numbers I can't tell the version of Batik I
used before -- according to CVS it must be about 17 month old. Here are
some comparisons of PNGs rendered with that Batik, with Batik 1.5 and
the SVG used to create them (kind of -- it is what XWeb would generate).
Total file size is less than 11kb.
Example one:
- http://www.itee.uq.edu.au/~pbecker/batik/overview_old.png
- http://www.itee.uq.edu.au/~pbecker/batik/overview_1_5.png
- http://www.itee.uq.edu.au/~pbecker/batik/overview.svg
This one looks pretty much the same to the old version in Adobe's viewer.
Example two:
- http://www.itee.uq.edu.au/~pbecker/batik/docco_old.png
- http://www.itee.uq.edu.au/~pbecker/batik/docco_1_5.png
- http://www.itee.uq.edu.au/~pbecker/batik/docco.svg
This SVG actually could be better -- at least Adobe's viewer doesn't
really like it.
Any explanation for this problem? Anything I can do to avoid it? If it
is a bug -- any hints were to dig in the code?
The problem is caused by our switching to use drawGlyphVector in many
cases instead of always drawing raw shapes. Fortunately you can override
this by saying text-rendering="GeometricPrecision". This should give
you the same rendering as before. You might also try 'optimizeLegability"
which will shut off anti-aliasing of the text - some people prefer it.
BTW: it still seems the gamma problem I have is still around. If you
look at http://tockit.sf.net with Internet Explorer you will notice that
the navigation PNGs are of a slightly different colour than the
surrounding bits and pieces. I tracked that down once to the gamma value
in the PNGs which seems to be ignored by most software but IE (e.g. the
site looks good in Mozilla). Is there any new insight on how to avoid
that problem?
From what you have said so far I would say it is a bug in what ever
other software you used to generate PNG files that they do not include
a gama chunk. You could hack Batik so it doesn't generate one but I
don't think this would be the right approach to take.
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