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From DeWeese Thomas <thomas.dewe...@gmail.com>
Subject Re: Text in SVG image "blows up" when using -dpi 600 with rasterizer
Date Wed, 24 Oct 2012 00:02:43 GMT
Hi Jonathan,
    The reason the text is blowing up is because the default Font size in Batik is 9pt. So
the font size is multiplied by the pixels/pt.  Also note that your top level SVG elements
are defined in pixels rather than in real world units so the -dpi 600 doesn't actually make
your output images any better.  You might consider either moving to real world units for the
root SVG element or use the -width option to produce a larger output image rather than -dpi.

    You can fix the font-size issue by adding font-size="9".


On Oct 23, 2012, at 12:56 AM, Jonathan Dagresta <jdagresta@sdl.com> wrote:

> One of our customers is complaining that when the use the rasterizer with –dpi 600
to create 600 DPI jpeg files from SVG’s, with some SVG files the text of the image “blows
up” to a very large size compared to the default 96 DPI result and compared to the other
drawn parts of the image.
> Attached are two SVG files, image1.svg which does not manifest this problem and image2.svg
which does show this problem.
> Attached are four JPG files (commands below used to create them):
> image1-096dpi.jpg (image1.svg converted to default 96 DPI JPEG)
> image1-600dpi.jpg (image1.svg converted to 600 DPI JPEG – text in image does not “blow
> image2-096dpi.jpg (image2.svg converted to default 96 DPI JPEG)
> image2-600dpi.jpg (image2.svg converted to 600 DPI JPEG – text in image clearly does
“blow up” to relatively large size)
> BATIK 1.7
> JAVA 1.5
> java -mx128m -jar batik-1.7/batik-rasterizer.jar -m image/jpeg -q .99               
      -d image1-096dpi.jpg image1.svg
> java -mx128m -jar batik-1.7/batik-rasterizer.jar -m image/jpeg -q .99 -dpi 600      
  -d image1-600dpi.jpg image1.svg
> java -mx128m -jar batik-1.7/batik-rasterizer.jar -m image/jpeg -q .99               
      -d image2-096dpi.jpg image2.svg
> java -mx128m -jar batik-1.7/batik-rasterizer.jar -m image/jpeg -q .99 -dpi 600      
  -d image2-600dpi.jpg image2.svg
> What seems a significant difference in image2.svg is that most of the text elements do
not specify font-size, while all of the text elements in image1.svg do specify the font-size
> So the question we have: Is the 600 DPI result of image2.svg => JPEG where the relative
size of the text in the image “blows up” an expected result due to the text elements not
specifying the font-size value, or is this a bug in the rasterizer?
> <image2-600dpi.jpg><image2.svg><image1-096dpi.jpg><image1-600dpi.jpg><image1.svg><image2-096dpi.jpg>
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