Strategies of loading image, select difference API to load image in difference case - http://java.sun.com/developer/technicalArticles/Media/imagestrategies/index.html

The Perils of Image.getScaledInstance() , with more detail explanation of image handling - http://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html 

In Part I we talk about the building blocks of metadata in images and how it may matter to you as developer. - https://hillert.com/blog/read-write-image-metadata-java-part-1/