How to select many areas on an image before applying effect and apply outside selection/s

[frer8833]

For example if i want to apply an effect (blacknwhite, blurs, saturation etc) outside some small lasso selected areas, it would be easier to just select the areas first and then press a button to activate 'apply outside selection/s' that makes effects  only apply outside the selected areas, instead of having to do it one by one by putting them on another layer.

Edited May 5, 2021 by frer8833

[Red ochre]

Use Edit/Invert selection first?

https://www.getpaint.net/doc/latest/SelectionTools.html

[BoltBait]

That button is Ctrl-I

 

What that does is invert your selection.

 

It is impossible for an effect to change pixels that aren't selected. So, simply invert your selection, run the effect, then you can invert your selection again to select the originally selected pixels.

 

[frer8833]

Thank you for invert-tool. Still wonder how to have many areas selected simultaneously before applying an effect.

Edited May 5, 2021 by frer8833

[BoltBait]

After making your first selection, hold down the Ctrl key while making your second selection.

[frer8833]

Wow, thank you.