FWIW, through use Tcl::pTk::TkHijack; both versions leak, this  $image = $phwin->Photo(-file => $pic_file ); and this  $image->read($pic_file, -shrink  );

This under 

tcl_version      8.6
tcl_patchLevel   8.6b1.2
tk_version       8.6
tk_patchLevel    8.6b1.2
tk_library       C:/Tcl8.6/lib/tk8.6

Tcl::pTk 0.90
Tcl 1.02
$^V v5.16.1
$] 5.016001

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In reply to Re^5: Tk photo display: memory never released by Anonymous Monk
in thread Tk photo display: memory never released by Discipulus

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