Exactly what I was looking for. Thanks! I tried making it a variable based on the users input 
$chart->set(cbrange => '[$x:$y]');

[download]
But it gives me an error "Column number Expected". Any ideas?

In reply to Re^4: Is it possible to create an interactive scale for palette in GNUplot? by Ppeoc
in thread Edited:Using Chart::Gnuplot to creat an interactive scale for palette? by Ppeoc

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