Filter>blur>field blur...

[nachofrades]

Hello:

I'm using Field blur in a work with many layers and doesn't work in a layer. Do somebody know if it's a bug?

It's a shadow layer very simple but appears white parts and strange effects...

Thank you...

A little example, the dark line is in one layer:

​

 

[MikeMc]

Screen capture your panels so we can see what you have

 

[IamSam]

Hey Nacho,

The effect your seeing is not a bug.

I can easily reproduce the effect by adding the the Field blur to the "Line" when it's on it's own layer.....





Here is the same Field Blur when the two layers are combined....





Hope this helps.

 

[nachofrades]

Thanks for the replys, but I need it in a layer, not combined, I work with a lot of layers, and I need them:

The screen capture:

 

[nachofrades]

In the worst case I will do it in "postproduction"

 

[Tom Mann]

The problem is that when blurring is done on a layer that includes transparent areas, it needs some information about the area surrounding the central object, but the algorithm has no idea what you might eventually put under it, so it has to make a guess.

It looks like it assumes the object is on a white background, blurs both the object and the white area, and then uses the original transparency info contained in the layer to feather the effect to transparency. If what's actually under the object is light, this is not a bad assumption. Otherwise, it's a bad assumption.

I think you are stuck applying the effect on composite layer of your own making, then applying the original transparency info to it. I know it's a manual, time intensive method, but I don't see any way around it.

T