Creating high resolution illustration is not so difficult, all you have to do is to work out you graphic in high resolution or in vector program like Corel when no matter was it original big or small, vector drawing can be saved in any resolution that is needed, all matters to your computer powers. What about photography?
I found some photo that is originally 138,2 MP, wow that is the really big one in metric size is 81,3 cm on 121,9cm in 300dpi, in 72dpi it is 338,7 cm on 508cm.
Photo of beautiful green field was took by Canon Eos Digital Rebel XT. Is this possible to create such huge photo by this camera? Or it was same kind of manipulation.
I am wonder.
p.s. It is so big that could be a billboard without putting to it any work.