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I want to write a simple application using opengl under linux. I want to open the image and allow the user to interactively select a rectangle. After that user can save it to a specific location.
Could anyone give me the startup links or sample code.
From your question I take it that you think OpenGL was some kind of imaging library. This is not the case.
OpenGL is meant only for drawing nice pictures to the screen. It deals neither with image loading, or storing. It’s also not meant for imaging operations like cropping (although this is actually quite easy to implement with OpenGL).
Regarding your question: OpenGL can be used for the “display the image” and “draw a rectangle around it” part. Loading and saving the image, and doing the actual crop is not to be done using OpenGL.