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jai image overlay

I am trying to dynamically watermark an image, so that it can be served via an applet.

I will be starting with a tiff image, that I would like to overlay a water mark with "sample" over the original image.

I have been experimenting with gif imagages to start with and have thought about using a transparent gif image; the watermark with JAI.create("overlay",src1,src2) to create the output RenderedImage.

The problem I am having with this, is that when I create a RenderedImage based on the transparent gif file, it is not decoding it properly, thus the resulting image is simply all black.

i'm not sure how to decode/encode the images properly and the following code is my attempt at opening, combining and saving images:
       public RenderedImage im1;
       public RenderedImage im2;
       public RenderedImage im3;
       private final String baseImFile = "base.gif";
       private final String waterImFile = "trans.gif";

      im1 = JAI.create("fileload",baseImFile);
      im2 = JAI.create("fileload",waterImFile);
      im3 = JAI.create("overlay",im1,im2);

How can I encode/decode the images properly to get the resulting image I'm after?

Once I get this to work, can i use a "base" tiff image with a "transparent" gif overlay? If not, any clues on how I go about this?

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1 Solution
JAI does not support transparent gif.
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Moondancer, this question is not even one week old.

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ypongsing ->  True, but as you see the list, one item dates back to the year 2000.  The goal is to provide ALL open/locked questions to request that everyone manages all their open questions, en toto.  This is why I added this verbiage to the beginning of this follow-up request.
This question is current, others below are not.  Some have had zero activity, for which you may wish
a refund so you can ask them again to draw current attention.  Let us know please.

Moondancer - EE Moderator
steeksAuthor Commented:
Thats all very well and good, but it would be nice if someone could actually post some comments that actually help with the problem..
steeks, post your question in the JAI discussion group. One of the Sun Engineer should be able to help you. Here's the URL:

Just to clarify, steeks, the urgency to close is not with this question.  The term "abandoned" question refers to any that have been inactive 21 days or longer.  I posted the above reminder to let you see all your open items as of that date, some of which are quite old.

Thank you, yongsing, for your help and ongoing support.  It is appreciated.

Moodancer - EE Moderator
More than two months later, please update and finalize this.
Moondancer - EE Moderator

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