Alternative to TR4520 capable of scanning to a PNG

I'm using a CANON TR4520 printer. I use a utility provided by CANON to scan documents to a PDF, but it can't scan to a PNG file. I'm told that isn't a flaw of the utility, but rather the TR4520 doesn't support that function. Does anyone know of a CANON printer similar to the TR4520 in terms of price and capability (except for the absence of PNG capability)?

TIA.
pwrichcreek.