So I need a simple OS X application (either an existing desktop application, or a simple command-line application) that can serialize a PNG image into a BLOB (keeping all metadata, etc.) for access by a SQLite (or any SQL-type DB) engine (used within a Cocoa/iPhone application).
AFAIK a SQLite3 BLOB is just the -bytes of an NSData. So if your PNG is a file, read it into an NSData instance and then use SQLite BLOB operations to insert the [data bytes] into the row. If your PNG is in memory, it is presumably either an NSImage (where it has largely lost its original PNG-nature) or it is an NSData already.
I'm not sure which "metadata" you want to preserve -- you probably ought to be more specific.
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