Problem with gaussian blur

[Cicki T]

I use the gaussian blur to get a blurred frame around photos. I make a selection, invert it and use the gaussian blur filter.
In many photos, the frame as in photo 1, the frame was blurred out at the edge.
All of a sudden it becomes a sharp edge instead as in photo 2.
What have I done wrong? Some settings I missed?

Edited March 24, 2019 by Cicki T

[R C-R]

If you are using the Live Gaussian Blur, make sure "Preserve Alpha" is not ticked.

[Cicki T]

@R C-R The problem is that I did’nt use the live gaussian blur at photo 1. I used the gaussian blur that you can find under FILTER.

 

[Alfred]

It looks as though the selection was feathered in photo 1 but not feathered in photo 2.

[R C-R]

11 minutes ago, Cicki T said:

@R C-R The problem is that I did’nt use the live gaussian blur at photo 1. I used the gaussian blur that you can find under FILTER.

The only way I know to get the effect shown in your photo 1 using the regular Gaussian Blur is to start with an image smaller than the canvas, or resize it to smaller than the canvas size, & then make & invert the selection before applying the blur. Is it possible that is what you did?

2 minutes ago, Alfred said:

It looks as though the selection was feathered in photo 1 but not feathered in photo 2.

If the selection was feathered, would the blur not be feathered along the inside as well as outside edge of the selection?

[Alfred]

6 minutes ago, R C-R said:

If the selection was feathered, would the blur not be feathered along the inside as well as outside edge of the selection?

If you created a frame-shaped selection and feathered it, then it would indeed be feathered along both the inside and the outside edges, but if you started with a feathered rectangular selection and subtracted an unfeathered rectangle inside that selection you’d end up with the result shown in photo 1.

[R C-R]

3 minutes ago, Alfred said:

If you created a frame-shaped selection and feathered it, then it would indeed be feathered along both the inside and the outside edges, but if you started with a feathered rectangular selection and subtracted an unfeathered rectangle inside that selection you’d end up with the result shown in photo 1.

But that does not sound like what the OP said was done for that photo:

19 hours ago, Cicki T said:

I make a selection, invert it and use the gaussian blur filter.

 

[Alfred]

2 minutes ago, R C-R said:

But that does not sound like what the OP said was done for that photo:

That’s true, but neither of the OP’s examples shows the expected result for that step!

[Cicki T]

@Alfred It's really strange, because I did exactly as I described:
I opened a photo, used selection and inverted it. Then I clicked on FILTER and GAUSSIAN BLUR.
At least 20 photos I did the same and it became like photo 1, then it suddenly became like photo 2! ??

5 hours ago, Alfred said:

That’s true, but neither of the OP’s examples shows the expected result for that step!

How should it look when you use the gaussian blur, if none of my photos above shows right?

[Alfred]

9 minutes ago, Cicki T said:

How should it look when you use the gaussian blur, if none of my photos above shows right?

As @R C-R pointed out, a frame-shaped selection should end up blurred/feathered along both the inside and the outside edges.

[Cicki T]

@Alfred So, something is wrong with "my" gaussian blur then. 

5 hours ago, R C-R said:

If you created a frame-shaped selection and feathered it, then it would indeed be feathered along both the inside and the outside edges, but if you started with a feathered rectangular selection and subtracted an unfeathered rectangle inside that selection you’d end up with the result shown in photo 1.

@R C-R I can try it.

Thank you for helping me!

[R C-R]

2 hours ago, Cicki T said:

 

8 hours ago, R C-R said:

If you created a frame-shaped selection and feathered it, then it would indeed be feathered along both the inside and the outside edges, but if you started with a feathered rectangular selection and subtracted an unfeathered rectangle inside that selection you’d end up with the result shown in photo 1.

 

No big deal but it was @Alfred who said that, not me.