Image Task

Image

Description

Applies a chain of image operations on a set of files.

Requires Java Advanced Image API from Sun.

Overview of used datatypes

Parameters

Attribute	Description	Required
failonerror	Boolean value. If false, note errors to the output but keep going.	no (defaults to true)
srcdir	Directory containing the images.	yes, unless nested fileset is used
encoding	Image encoding type. Valid (caseinsensitive) are: jpg, jpeg, tif, tiff	no (defaults to JPEG)
overwrite	Boolean value. Sets whether or not to overwrite a file if there is naming conflict.	no (defaults to false)
gc	Boolean value. Enables garbage collection after each image processed.	no (defaults to false)
destdir	Directory where the result images are stored.	no (defaults to value of srcdir)
includes	comma- or space-separated list of patterns of files that must be included. All files are included when omitted.	No
includesfile	the name of a file. Each line of this file is taken to be an include pattern	No
excludes	comma- or space-separated list of patterns of files that must be excluded. No files (except default excludes) are excluded when omitted.	No
excludesfile	the name of a file. Each line of this file is taken to be an exclude pattern	No
defaultexcludes	indicates whether default excludes should be used or not ("yes"/"no"). Default excludes are used when omitted.	No
caseSensitive	Boolean value. Sets case sensitivity of the file system.	no (defaults to false)
followSymlinks	Boolean value. Sets whether or not symbolic links hsould be followed.	no (defaults to true)

Parameters specified as nested elements

This task forms an implicit FileSet and supports all attributes of <fileset> as well as the nested <include>, <exclude> and <patternset> elements.

ImageOperation

Adds an ImageOperation to chain.

Nested Elements

ImageOperation can handle nested Rotate, Draw, Rectangle, Text and Scale objects.

Rotate

Adds a Rotate ImageOperation to chain.

Parameters

Attribute	Description	Required
angle	Float value. Sets the angle of rotation in degrees.	no (defaults to 0.0F)

Scale

Adds a Scale ImageOperation to chain.

Parameters

Attribute	Description	Required
proportions	Sets which dimension to control proportions from. Valid values are: "ignore" - treat the dimensions independently. "height" - keep proportions based on the width. "width" - keep proportions based on the height. "cover" - keep proportions and fit in the supplied dimensions. "fit" - keep proportions and cover the supplied dimensions.	no (defaults to ignore)
width	Sets the width of the image, either as an integer or a %.	no (defaults to 100%)
heigth	Sets the height of the image, either as an integer or a %.	no (defaults to 100%)

Draw

Adds a Draw ImageOperation to chain. DrawOperation DataType objects can be nested inside the Draw object.

Parameters

Attribute	Description	Required
xloc	X-Position where to draw nested image elements.	no (defaults to 0)
yloc	Y-Position where to draw nested image elements.	no (defaults to 0)

Examples

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

Create thumbnails of my images and make sure they all fit within the 160x160 size whether the image is portrait or landscape.

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

Creates a thumbnail for all PNG-files in src in the size of 40 pixel keeping the proportions and stores the src.

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

Same as above but stores the result in dest.