Lightroom hack #01: Intersect Mask

Lightroom hack: Intersect mask
(Image credit: Rod Lawton)

The introduction of AI masking is one of the biggest and most significant steps forward in Lightroom for years, and one of the first tools to appear was sky selection.

This is great for any outdoor photography, and not just landscapes but architecture and travel too. Very often the sky is just a little too bright for the rest of the shot, and this is a quick, simple and very effective way to adjust it separately.

But there are a couple of issues. One is that Lightroom’s sky masking isn’t always perfect around more complex horizon lines with lots of small details or trees and vegetation, for example. No doubt this will improve but it might never be properly solved, and one of the complicating factors is that Adobe’s AI masking is quite hard-edged. It tries to find outlines to follow. Even where it softens the mask edge, it’s often quite crude and obvious.

Even if the edge masking is good, there’s another problem. Skies naturally lighten towards the horizon line, but the sky masking takes no account of this.

But there’s an easy answer! One you’ve made your adjustments to the sky mask, click the three-dot gadget to right of the mask in the panel and choose Intersect with Mask > Linear Gradient. 

Lightroom's sky mask has done a fair job of selecting the sky, but your adjustments will be applied equally from the zenith to the horizon, and the result just doesn't look natural. But all I need to do is intersect that sky mask with a linear gradient. (Image credit: Rod Lawton)

That's much better! The castle and distant hill are still masked but the sky gradation now looks natural. (Image credit: Rod Lawton)

Now you can drag out a linear gradient from the top of the sky to the bottom – and the sky mask will have been combined with the gradient. Any tall buildings or other objects against the sky will still be masked, but the sky will have a more natural gradation.

Lightroom’s AI masking tools may not always yield the perfect result straight off, but they can easily be modified and added to in order to refine their effect.

Read more:

Best photo editing software
Lightroom review
Lightroom Classic review

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Rod Lawton

Rod is an independent photography journalist and editor, and a long-standing Digital Camera World contributor, having previously worked as DCW's Group Reviews editor. Before that he has been technique editor on N-Photo, Head of Testing for the photography division and Camera Channel editor on TechRadar, as well as contributing to many other publications. He has been writing about photography technique, photo editing and digital cameras since they first appeared, and before that began his career writing about film photography. He has used and reviewed practically every interchangeable lens camera launched in the past 20 years, from entry-level DSLRs to medium format cameras, together with lenses, tripods, gimbals, light meters, camera bags and more. Rod has his own camera gear blog at but also writes about photo-editing applications and techniques at