Force PNG gamma update

Simon Lord slord at
Sat Jun 12 12:35:26 EDT 2010

So I found a post suggesting that after setting the screenGamma to
force the PNGs to update by performing the following:

set text of img 1 to the text of img 1

Well, to quote a famous actor—"The goggles do nothing!".

What's the best way to successfully force the PNGs to render properly
after a screenGamma setting?

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