This page describes the features of the SVG Rasterizer utility that comes with the Batik distribution. The SVG Rasterizer is a utility that can convert SVG files to a raster format. The tool can convert individual files or sets of files, making it easy to convert entire directories of SVG files. The provided formats are JPEG, PNG and TIFF, however the design allows new formats to be added easily. In addition, the rasterizer can (despite its name) transcode to PDF.
Downloading the rasterizer
Rasterizing one or several SVG files
The method for starting the rasterizer depends on the distribution of Batik that you chose to download. The following describes how to start the viewer for each distribution.
Using the binary distribution
If you downloaded the binary distribution of Batik, you should have a file called batik-1.6.zip (or similar), and, after expanding that file, a jar file called batik-rasterizer.jar. To start the rasterizer, open a console, go to the directory where you expanded the distribution (and where batik-rasterizer.jar is located) and simply type the following at the command prompt:
java -jar batik-rasterizer.jar FILES
For example, if you type:
java -jar batik-rasterizer.jar samples/batikFX.svg
you will see the following printout:
Converting file: samples/BatikFX.svg to samples/BatikFX.png
Once the conversion is complete, you will find a batikFX.png file in the samples directory.
You can pass options on the command line:
java -jar batik-rasterizer.jar [OPTIONS] FILES
where, as options:
java -jar batik-rasterizer.jar -d myDir -m image/jpeg samples/*.svg
will generate JPEG images for all the SVG files found in the samples directory.
Using the source distribution
If you downloaded the source distribution of Batik, you got a zip or tar file that expanded into a directory called xml-batik or batik-version. In that directory, you can find build scripts for the platform you are running on. For example, there is a build.bat script for users of the Windows platform and there is a build.sh script for UNIX users.
To start the rasterizer you should:
- Make sure that your JAVA_HOME environment variable is set to your JDK installation directory.
- Open a command line window and go to the xml-batik or batik-version directory where the Batik distribution was expanded.
For windows, type the following at the command prompt:
and for Unix:
This will print out a help message for the rasterizer.
You can pass options to the rasterizer as follows, for Windows:
build svgrasterizer [OPTIONS] FILES
and for Unix:
./build.sh svgrasterizer [OPTIONS] FILES
Refer to “Using the binary distribution” for an explanation of the options.
Rasterizer Ant task
The Rasterizer task is an Ant version of the rasterizer utility. It fulfills the same basic purpose as the utility but has a different syntax and a slightly different set of features.
The task is able to produce four raster formats: PNG, JPEG, TIFF and PDF.
Using the rasterizer task
The first thing to do is to compile rasterizer task classes. Download the source distribution of Batik and see the README file in the contrib/rasterizertask directory for more instructions. The build procedure works the same way as when building Batik itself.
After building, ensure that the generated batik-rasterizer.jar and the classes (or jar file) of the rasterizer task are in your CLASSPATH.
Next you have to define the task in your Ant project. To do this, add the following line either after the project start tag or after the target start tag in the target you are using the rasterizer task:
<taskdef name="rasterize" classname="org.apache.tools.ant.taskdefs.optional.RasterizerTask"/>
Parameters of the Ant task
The following table lists the attributes that may be specified on the rasterize task element.
|result||Sets the type of the result image. Only one of the following values must be used: image/png, image/jpeg, image/tiff and application/pdf. The value must be in lowercase letters.||Yes|
|height||Sets the height of the result image in pixels. The task calculates the height from the SVG file if this parameter has not been set. The rasterizer keeps the aspect ratio of the SVG file even if the both height and width have been set.||No|
|width||Sets the width of the result image in pixels. The task calculates the width from the SVG file if this parameter has not been set. The rasterizer keeps the aspect ratio of the SVG file even if the both height and width have been set.||No|
|maxheight||Sets the maximum height of the result image in pixels. The image won’t be higher than defined in this parameter, regardless of the size set in the image itself or in other parameters. This is a floating point value.||No|
|maxwidth||Sets the maximum width of the result image in pixels. The image won’t be wider than defined in this parameter, regardless of the size set in the image itself or in other parameters. This is a floating point value.||No|
|quality||Sets the quality of the produced image. The value must be greater than 0 but smaller than 1, larger numbers meaning higher quality. The quality value is used only with JPEG images. The default quality value is 0.99.||No|
|area||Defines the area in the SVG file which will be rasterized. Parts outside this area are discarded and don’t show in the result image. The area attribute value has four integers separated by commas. The first two integers set the x and y coordinates of the upper left corner of the area, respectively. The last two integers set the width and height of the area, respectively. For example, 10, 20, 100, 200 sets the rectangular area from point 10, 10 to point 110, 220. The specified area is applied to all images if more than one file is rasterized during one task.||No|
|bg||Sets the background color of the result image. The bg attribute value is either three or four integers separated with commas. The four values are alpha channel, red, green, and blue, respectively. If only three values are given, then the values are red, green, and blue and the alpha channel is automatically set to 255 (opaque). All values have to between 0 and 255. The default value is none which means that background is transparent and not filled with any color.||No|
|media||CSS media type that is used to select a CSS stylesheet. The selected stylesheet is then used to rasterize the SVG files. Only the visual media group is supported (see the CSS2 specification for more information about media groups). The default value is screen.||No|
|dpi||Resolution for the result image. The attribute value is used to compute the “pixel to millimeter” ratio used when processing SVG files. The default value is 96.||No|
|lang||Language which is used select language specific areas from the SVG file during the rasterizing process. The valid values are defined in RFC3066. The default value is en.||No|
|src||Name of a one input file. Use this parameter to convert just one file whose name and location are known. The dest parameter must also be given.||One of the following is required: src attribute, srcdir attribute or fileset element(s).|
|dest||Name of a one output file. Used this with src parameter only. The output directory is created if it doesn’t exist.||Required if src is used.|
|srcdir||Name of the input directory. srcdir and fileset elements can be combined and srcdir can be omitted if there is at least one fileset child element. srcdir file selection can be controlled with include, exclude, etc. child elements. Note that without control parameters the task tries to rasterize all files in the given directory.||One of the following is required: src attribute, srcdir attribute or fileset element(s).|
|destdir||Name of an output directory. Use this with the srcdir attribute or fileset elements. The task generates the names of the output images by changing the suffix of the input file names to correspond the result image type. A suffix is added if the input file doesn’t have one. Output directories are created if they don’t exist.||Required if srcdir attribute or fileset elements are used.|
|classname||Class name of the XML parser used to parse SVG images. The value can be either the complete classname with package information included or the special name jaxp, which means any available parser in the CLASSPATH that supports JAXP. See the Batik code for the default value.||No|
Examples of using the rasterizer task
The following example is the complete Ant project that converts an SVG image (called input.svg) to a PNG image (called output.png):
<?xml version="1.0"?> <project name="RasterizerExample" default="main" basedir="."> <taskdef name="rasterize" classname="org.apache.tools.ant.taskdefs.optional.RasterizerTask"/> <target name="main"> <rasterize result="image/png" src="input.svg" dest="output.png"/> </target> </project>
The next example is just one task in a project. It converts all files with a .svg suffix in the images directory and all files in the images2 directory to TIFF images. The resulting image files are placed in the results directory.
<rasterize result="image/tiff" destdir="results"> <fileset dir="images"> <include name="**/*.svg"/> </fileset> <fileset dir="images2"/> </rasterize>