perl/Tk do not have underlying Tcl/Tk code, because it is a full migration of tcl/Tk to Perl, with some possible mistakes in the middle.

So it is quite possible for some feature to being improved in Tcl/Tk but is stale in Perl/Tk.

I beleive you'll got that snippet of your code working via Tcl::Tk, which provides Tcl/Tk with perl/Tk syntax; but this module do not maintain 100% compatibility of perl/Tk syntax, however.
But you'll have a possibility to use those Tcl/Tk libraries lacking in perl/tk

In reply to Re^3: Tk:Photo -data with binary data? by vkon
in thread Tk:Photo -data with binary data? by BrowserUk

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