Is there any way to upscale the default 320X240 restiction?

After reading this an article on neogaf about "The lost art of FFIX", I got amazed how much detail was lost in downscaling. Is there any way for me to modify the ISO file or use some sort of emulation tool which would allow me to swap default FFIX 320X240 images with these, 1024X768 images?
 
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