How to deallocate Blob memory in IM

Hi,

I am using IM with OpenGL for generating textures from images of various
formats. For doing this I am using RGBA "Blob's" and through them I build GL
mipmaps to get them rendered. All works fine till this point but due to
limitations on main memory space(the images are huge), I need to deallocate
and free up space by clearing the used blobs. I looked around and found no
methos to do this deletion of Blobs.

Can someone please tell me how I can accomplish this?.

Any suggestions with actual code examples would be awesome as I am very
short on time and this is urgent.

Thanks!

-Shantanu