Converting GIF images to JPG - display problems in browser

I am currently writing a program that uses the ImageIO package (javax.imageio.*) to take GIF and PNG images and convert them to JPG images. The program seems to convert them correctly, especially for the PNG images, but the converted GIF images don't open in a browser. They open just fine in Windows Picture and Fax viewer, but when I try to open them in IE or Firefox, it only diplays the little red 'x'.
Is anyone familiar enough with Images and the ImageIO package in Java that they may have some insight on why these converted GIF files won't display in a browser.

Bonjour,
In my [website|http://iweb.debutersurmac.com>, all the images are JPG files,
By default iWeb '09 converts images to JPG (yes, it's true)...
...unless you use masked images*
!http://i32.servimg.com/u/f32/09/02/44/99/masked10.jpg!
Crop your images (with Preview) before you paste them in iWeb. Don't use mask, Unmask an image if it's masked. That's the trick!
!http://i32.servimg.com/u/f32/09/02/44/99/unmask10.jpg!
(* images with transparency areas (ex : some PNG and GIF), rotation and shapes in iWeb make also PNG files in your website.)

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Moderator message: not related to ABAP development.
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Converting GIF images to JPG - display problems in browser

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