In this guest post, the Photoshop developer Scott Murdock tackles the apparently familiar topic of Luminosity Masks – with very interesting findings for anybody using them. Enjoy!

Everywhere you go you read about Luminosity Masks – I’m really surprised it doesn’t have its own Wikipedia Page! (Maybe I’ll take care of that).  It is truly a great tool to have in your toolbox, very powerful when used correctly. It’s greatness by simplicity. But how does it works? Not in the sense “how to create it”, but what really happens behind the scenes?

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