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You can define filename transformations by using a nested mapper element. The default mapper used by <image> is the identity mapper.

You can also use a filenamemapper type in place of the mapper element.

Examples

Create thumbnails of my images and make sure they all fit within the 160×160 pixel size whether the image is portrait or landscape.

<image destdir="samples/low" overwrite="yes">
    <fileset dir="samples/full">
        <include name="**/*.jpg"/>
    </fileset>
    <scale width="160" height="160" proportions="fit"/>
</image>

Create a thumbnail for all PNG files in src of the size of 40 pixels keeping the proportions and store the src.

<image srcdir="src" includes="*.png">
    <scale proportions="width" width="40"/>
</image>

Same as above but store the result in dest.

<image srcdir="src" destdir="dest" includes="*.png">
    <scale proportions="width" width="40"/>
</image>

Same as above but store the result to files with original names prefixed by scaled-.

<image srcdir="src" destdir="dest" includes="*.png">
    <scale proportions="width" width="40"/>
    <globmapper from="*" to="scaled-*"/>
</image>

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