Lightroom mobile: Adjustment brushes are too large when adding to a mask

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  • Problem
  • Updated 12 months ago
  • In Progress
  • (Edited)
When I paint a mask using a certain sized brush I can control this fine. If I need to earse an area and chose a very small brush the first go gives me a much larger area, making it impossible to erase just a small area. If I then go back and paint in more mask, I get the same effect. I have checked the brush size each time but it seems no matter how small, a large area gets effected. It’s almost like auto mask is on, only I don’t think we have that feature. This is on my iPad Pro 12.9, running ISO10.3.3 or 11 B3. Very frustrating.
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Dave Pearce

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  • confused.

Posted 12 months ago

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Rikk Flohr, Official Rep

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I am trying to duplicate what you are seeing Dave but not getting very far.

1. I select a brush, size it, adjust feather, opacity and paint a stroke.
2. I then select and eraser, size it very small adjust feather opacity and erase a portion of the previous stroke. 
3. Then I select the brush again a few strokes.
4. Lastly, I reselect the eraser.  It remembers my previous size, feather and opacity.  I erase and the eraser size and area affected remain small.

What am I misunderstanding?  If I am reading you correctly, step 4 is where you get an unexpectedly large area erased. I am not seeing that. 
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Dave Pearce

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Hi Rikk.

Thanks for the reply. Thats pretty much what im doing. Just a couple of points.
The Brush sizes themselves arent changing, at least not in general. Its just that first hit each time that seems to cover a much wider area.
For example.
I mask the background of an image but end up going over some of the foreground subject. I select a small eraser brush, with hardly any feather, and place it on the foreground image near the edge, but definitely not so the brush goes over the edge. When i lay my finger (or Apple pencil) on the screen the easer will erase quite a lot of the area outside of the subject instantly. So ill go back to the Masking brush and again, place it near the edge. Same thing will happen, the mask flows over in to the subject.
If i start either of these process from further out then all is fine. I can get very precise masks.
its like the sort of thing you see if using Auto mask with a large brush in the Desktop version.

I hope some of that makes sense.
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Rikk Flohr, Official Rep

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Thanks for the update, Dave - definitely not what I am seeing. I am going to try to loop in a developer on this thread.  Stand by. 
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Dave Pearce

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Thanks Rikk.
If i can shed more light on this i will let you know.
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Dave Pearce

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Rikk.Ive just made a very short video showing this issue. I’m not sure what to do with it now. Can i send it to you?

This. Link should work

https://drive.google.com/open?id=0B7t...

It shows me trying to erase a small section of a Mask. you can see how small the brush is and how large the area it erases is.
(Edited)
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Dave Pearce

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Another update. If i use the Eraser and erase part of the mask, and then use the back arrow to undo that, the area gets filled back in. As expected. When i then make another stroke with the Eraser the first one re appears.
Hope ive explained that right.