License: Apache License ( http://www.apache.org)
Download: jakarta-taglibs-sandbox/image
Technologies: J2EE, Java2D, ImageIO, Java Advanced Imaging
A set of JSP Custom Tag libraries for dynamic image manipulation
that can replace the <img> tags of HTML.
The Image Tag library has tags that will help the JSP page developer
to present slightly different variations of existing image/images
in the page. Typical uses are thumb-nailing, changing contrast,
brightness, color shades, gray-scaling, scaling, image/ text overlay,
etc. Implementations using Java 2D API, Java Advanced Imaging
API and Standard Windowing Toolkit are being developed.
For those who do not want to install the WAR file but would still like to
see the output of the examples, I have uploaded the saved output files.
These are not dynamic anymore.
1. Overlay/ write Text on a Cropped image after Resizing (JPEG)
<img:image src="/images/splash.jpg" name="gs.jpg" refresh="true" >
<img:crop x="0%" y="25%" width="100%" height="30%"/>
<img:resize scale="200%"/>
<img:text text="A part of the Jakarta Tag library" x="2" y="95%"
font="Arial" bold="true" size="16" color="0x440000"/>
</img:image>
Output :
2. Rotation after Resizing (GIF converted to PNG)
<img:image src="/images/new.gif" name="sr.png" refresh="true">
<img:resize scale = "80%" />
<img:rotate degrees="-30" />
</img:image>
Output :
3. A colored Border to an image with an image (the one generated above)
Overlaid.
The white background is set as the transparency color (JPEG)
<img:image src="/images/splash.jpg" name="brdr.jpg" refresh="true" >
<img:border width="10" height="5" color="0x44dd44" />
<img:overlay x="5%" y="50%" name="sr.png" color="0xffffff" tolerance="35"
/>
</img:image>
Output :
4. Overlay a transparent image on a Grayscaled image and Resized (PNG on
JPEG)
<img:image src="/images/splash.jpg" name="gr.jpg" refresh="true"
imagingType="JAVA2D">
<img:grayscale/>
<img:overlay x="2%" y="2%" src="/images/new.png" />
<img:resize scale = "70%" />
</img:image>
Output :
