Easy fast way to fix edges of masks in Lightroom and Camera RAW

Colin Smith

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This tutorial shows you the fastest, easiest way to fix edges on masks in Lightroom or Camera RAW, it’s easy and it really works!

Here is a simple way to get rid of edge halos on mask edges in Lightroom or Camera RAW. We are in the develop module of Lightroom Classic, but this tutorial will work exactly the same for Adobe Camera Raw.

Let’s lighten the foreground and gazebo without changing the sky and water.

Sunset gazebo and dark foreground on a sea cliff open in Lightroom Classic Develop module

Click the new mask button

Masking button highlighted in the Lightroom Classic tool strip above the Basic panel

Choose the ai Subject

Subject button highlighted under Add New Mask in the Lightroom masking panel

A mask will automatically be added to the subject. Sometimes, it will get the whole thing and other times, it will get a partial selection as shown.

We need to add the grassy foreground

Red mask overlay covering the gazebo after Select Subject in Lightroom

In the Masks panel, click Add

Add button highlighted under Mask 1 in the Lightroom Masks panel

Choose Objects

Objects chosen from the Add to Mask menu in Lightroom Classic

You will see a brush and a selection option in the mask panel. Choose brush.

Paint over the area you want to select. It doesn’t have to be perfect, just enough to let Lightroom/ACR know what you want it to select.

Red overlay painted roughly over the grassy foreground with the Objects brush

The ai will do its thing and make the selection.

Gazebo and foreground both covered by the red mask overlay in Lightroom

Adjust the Exposure and Shadows to brighten the foreground

Notice we have a light fringe on the transition between the ocean and the foliage. This is called a halo, and it’s common.

Lets fix it

Brightened gazebo and foliage showing a glowing halo along the sea horizon edge

Red outline marking the halo along the edge of the foliage and the water

Inside the mask, choose subtract

Subtract button highlighted under Mask 1 in the Lightroom Masks panel

Choose Brush

Brush chosen from the Subtract from Mask menu in Lightroom Classic

Set the feather and flow to 100.

Turn on Auto Mask

Auto Mask checkbox highlighted with Feather and Flow set to 100 in Lightroom

If you look at the cursor, you will see a minus sign. This means the brush will remove.

The way auto mask works is to keep the center inside the areas you want to select. We will take the area between the 2 rings and use that to retouch our image. Watch the video at top to see it in action.

Brush cursor with a minus sign inside the gazebo roof, pointed out by a yellow arrow

Begin to paint

Auto Mask brush rings painting along the edge of palm fronds and the ocean

Notice just the area between the 2 rings is going over our foliage, and it’s working nicely!

Auto Mask brush cleaning the edge between foliage, a rock and the sea

Here is the result. Some things can be really simple, but still effective.

Final sunset photo of the gazebo with a brighter foreground and no edge halo

I hope you enjoyed this tutorial and found it useful!

Thanks

Colin

This is just a little taste from my brand-new course on Masking in Lightroom and Camera RAW.

If you want to master these very important image editing tools, check out the course. 

Masks in Lightroom and Camera RAW (in Photoshop)

This new 3+ hour set of 26 tutorials will help you master the use of the new Masks in Lightroom or /and Camera RAW. Get it hereMasks in Lightroom and Camera Raw course banner by Colin Smith

Get the course here


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24 comments

  1. A wonderful tip, Colin! Thanks for sharing. I so appreciate your generosity.

    I wondered why you didn’t use select sky for the mask and then invert it. That always seems to work well.

    1. Colin Smith Author

      Because I wanted to show the Object selection tool 🙂

  2. Sue Olsen

    I like how you break these tools down in little bits. It is much easier to absorb.

  3. Karen Hirsch

    Please do another example. I did not see exactly how this works. Perhaps a written explanation would make it more clear.

  4. great, but why did you pick up the golden color and use Auto Mask? You went quickly and I did not understand that.

  5. why did you pick up the golden color and use Auto Mask? You went quickly and I did not understand that.

  6. Kathleen Simon Towns

    This is an amazingly simple technique that I plan to use ! -Thank you.

  7. Paul Shilling

    Looks like a great way to fix the edges of masks in LRC without having to edit in PS. I am looking forward to giving it a try.

  8. JOHN TALLEY

    Thanks, I have had this problem and find your solution very easy to use (KISS).

  9. Alec Dann

    Colin, great technique. I’ve often run into this issue. Question for you: As I understand it, automask samples from the center of the brush. When you were brushing where the center crossed the dark rock out in the sea, I didn’t see you making any effort to avoid it even though that rock was more like the dark vegetation in the foreground. Can you expand on what level of attention is required on the location of the sample point?

    1. Colin Smith Author

      You can be pretty loose, just make sure you don’t cross into your main subject

  10. David Hayman

    Hi Colin,
    If I had your PS skills I’d be driving a Ferrari. You’re a super teacher.

  11. karen roberts

    Your explanation was simple and effective. Thank you. Always learn something new with your ‘short hints’.

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