One of the advantages of having a DSLR or an expensive prosumer digital camera is its support for RAW image format. This gives you the flexibility to tweak the image as you want it – no compression, no, nothing! However, this format is not available on affordable consumer cameras. Not anymore!
Just a word of caution, just like any firmware hack, do at your own risk. :) I might just do this and see what happens.
[image courtesy of Flickr:alisdair]