I've just started using this colour picker:
http://code.google.com/p/auroris/wiki/ColorPicker
One of the warnings its documentation provides is that when you compile
it with GWT, the images it contains are compiled into a png file that is
about 1MB. Whereas, if you then open that file in any image processing
software and re-save it, it compresses down to around 110kb.
The problem is that during the compile, GWT's ImageBundleBuilder uses
javax.imageio.Imageio.write(BufferedImage, "png", outputStream), and
with an out-of-the-box JDK installation, the javax.imageio.Imageio stuff
does not support png compression. (png has support for the deflate
algorithm built-in, but it seems you don't *have* to use it when writing
out png files)
However, by installing an additional package to add to my JDK, I managed
to get a gwt compile to produce compressed png files:
http://download.java.net/media/jai-imageio/builds/release/1.1/INSTALL-jai_imageio.html#Manual
Some of my small png files got slightly bigger, but that 1MB png got
much smaller.
This is a known bug in the JDK, and there's a bug report here:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4829970
but that's a very old bug report, so may not be fixed any time soon.
Is this something that GWT could address, so that this would work
correctly out-of-the-box?
Thanks,
Paul
--
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