This quite pleasing special effect can be implemented easily in Opentoonz. Your animations will be looking great in no time! As long as you don't use it too much...
Download Opentoonz: opentoonz.github.io/e/
A B O U T [] C A S T LE D A R K
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Castle Dark Official Website: sites.google.com/view/castledark/home
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S U P P O R T [] T H E [] C H A N N E L
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Check out my other art/animations on Twitter: twitter.com/NobleFrugal
NobleFrugal Studio