Selections and Gaussian blur

Started Aug 27, 2018 | Discussions thread
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Eliot Kramer Contributing Member • Posts: 998
Selections and Gaussian blur

Hello.

I am noticing a behavior that is not consistent and I would like to be able to control it.

Here is the setup.

Sometimes, when I make a selection and use a Gaussian blur or similar filter on that selection it will take the pixels outside the selection and average/blur them in, so that the selection is contaminated, when in fact the reason I made a selection is to apply the filter only "inside".

Same happens in reverse, sometimes it will take pixels from inside the selection and smudge them out.

Then finally, and this is what I am trying to do, I would like the effect to be confined entirely inside the selection and not involve outside pixels. This has happened to me occasionally but I don't know why or how, it just worked "perfectly" the way I wanted to.

As of right now I make a selection, blur it out, it gets contaminated, then I erase it back carefully to get rid of the contaminating effects, then repeat on a smaller area if there is still clean up necessary. This is super slow and tedious.

BTW, my PS is possessed so it does things on its own sometimes so it has behaved differently at times without me knowing exactly what I did.

Thank you

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