Inspiring

질문

Sometimes Subtract brush on a mask don't work at all

Forum|Forum|3 years ago
December 17, 2022
2 답변들
4500 조회

Hi,

I guess the attached screenshots are self-explainatory, I make a background mask which is not perfect (part of my subject is also selected). I click on substract and choose a brush: impossible to substract anything, the brush has absolutely no effect (screenshot 04, not visible but believe me!) .

If I choose to substract with the radial or gradient the mask it works fine... (screenshot 05)
What happens?

Thank you

PS: last version of LRC / MacOs 12.6

macOS

이 주제는 답변이 닫혔습니다.

R

richardplondon

Community Expert

Just to make sure: when working on this new mask component layer (set to subtract) you do not want to ERASE with your paintbrush. You want to ADD painted areas - and the more painting you do, the more areas you are removing from the overall mask selection.

This is especially confusing because usually the paintbrush shows a + sign when it is adding more 'paint', and a - sign when it is removing 'paint'.

However in the special case of a mask layer that is set to Subtract action:

the + and the - symbols in the middle of the brush show reversed.

So in this context you DO want to paint with a "-" symbol in the middle of the brush - meaning, this brush will be adding on MORE (subtracting) 'paint'.

ralphlouzon작성자

Inspiring

I acknowledge that +:- symbols can be confusing in LRC.
In that case my aim is to erase a part of a mask (Background type), I select Substract and I get indeed a brush with a "-" sign. And it works! But most part of the time... sometimes not, that's my problem.

Maybe I mess around things, if so I don't understand what.

Here other screenshots in the message body: the tool selected in the mask panel and the look of this tool on the picture. (this time it works perfectly)

R

richardplondon

Community Expert

In your screenshot 4, I notice the Density slider is disabled and this is characteristic of the brush being in Erase mode. But most likely, that is just a side effect of making your screenshot (perhaps pressing the same modifier key for doing that, which also switches the brush between paint and erase). But I thought I should mention it.

This does sound to me like some difficulty or variation in the brushing itself. Are you using a pressure sensitive pen, or a mouse?

I suppose if sometimes the mask was set to Add, unintentionally, instead of Subtract. Or pressing number keys while brushing (so, reducing the brush strength without meaning to). But I expect you know what you are doing in those aspects.

dj_paige

Legend

I guess the attached screenshots are self-explainatory

Not self-explanatory to me. My web browser refuses to show file attachments. If you could provide screen captures by clicking on the "Insert Photos" icon, then I can see them.

A guess without seeing your screen captures: in the brushing tool sliders, you have set either Density or Flow (or both) to zero

ralphlouzon작성자

Inspiring

Thank you for reading dj_paige.
I resend all the screenshots and hope you will see them (they are simple JPGs). You could see that Opacity and Flow are at 100%.

I add these observations:

- Once I can substract with radial mask for instance, the substract brush works again...

- This bug doesn't appear each time, I worked on similar pictures with no issue (and exactely the same settings).

dj_paige

Legend

Ralph: I said "If you could provide screen captures by clicking on the 'Insert Photos' icon"

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