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Preserving the quality of images

 
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Hi All
Here's my problem.
I have created a Servlet where the users can upload their image files to their respective directories.The size of the image can be anything e.g 200x250 or 350x400 and so on.But when the image is displayed on the user's web page it should display a 100x150 image.How can I do this without losing the quality of the uploaded image.
regards
sanj
 
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