It sounds like PNG support is added/improved in Tk 8.6.x (cf. https://wiki.tcl.tk/6150), so if it's possible to upgrade, I'd give that a try.

The other approach out there for older Tcl/Tk might be to have either the Img, Pixane(no longer available?), or tkPng extension installed.

In reply to Re^2: tcl::pTk GUI icons by chrstphrchvz
in thread tcl::pTk GUI icons by Anonymous Monk

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