GIMP Version: 2.8.6
Operating System: Windows
GIMP Experience: Basic Level

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Hi folks, I'm wondering if anyone knows if a script or plugin has been written that can produce this effect on the outside of selection.
Before image

After image

I have tried a lot of different filters and had a look through G'mic but so far I can't find anything that does what I need.

I thought the Motion Blur filter under the Filters->Distorts menu when set to Radial Zoom and Outer looked very promising when I used a square shape.
But then I found it produces a different effect depending on shape even though I used exactly the same settings.
Perhaps as a second question, someone with technical insight might be able to explain why motion blur radial Zoom is producing such varying results.
Gimp's Motion Blur results are shown below, note the lengths of the blur exceeds the value entered on the square and circle. In the case of the rectangle, the length varied also whether it was the long or short sides.

G'mic had a Radial blur option too. So I ran that on the same shapes I tested above, but that didn't produce what I needed either, see image below.

Thanks in advance for any help you can offer.

I cant get it to work but was wondering if you could do that by feathering a selection. Can't think of a script that does it, sorry Fluffy

Nothing that can't done manually. From you initial selection:

- Add new transparent layer
- Edit/Stroke selection: use a line about as wide as the width of the final gradient
- Invert the selection
- Apply a Gaussian blur, this blurs the outside of the line
- Invert selection again and delete
- Layer/Transparency/Alpha to selection: you have your selection



If you want some finer control on the blend:
- work on a black layer instead of transparent, stroke with white
- once the blend is produced, use Curves or Levels to adjust its look
- in the Channels dialog, right click one of the color channels and "Channel to selection"

You can also do the same thing working directly on a channel.

Select->Save To Channel
Select->Border... -- Check the "Feather border" box
right-click on the "Selection Mask copy" channel and run the command "Subtract from selection"
return to your Layers dialog and activate the original layer
bucket fill the selection

or RobA's pathblend script, needs 2 paths

Will Kevins "Xach Blurry Thing" script accomplish this?

Thanks everyone for your replies and interest.
Firstly, my apologies - I have corrected a mistake in the original post. Perhaps that is the reason no-one has yet answered the second question about Motion Blur. Please re-read my original post for the corrections.

My first question (as per the title of the thread) has now been answered, it appears there isn't one.

I was asking to see if a script already existed that did this as I was going to create one to automate the process for myself. But I appreciated seeing the methods offered by saulgoode and ofnuts.

Thanks rich2005, I did not have the Path Blend script so that was helpful too.

In the case where I don't have one contiguous selection or the selection contains multiple colours the methods and examples above still don't achieve my aim.

Motion Blur Zoom came the closest to the result I was after.
While experimenting with this Plugin/Filter I noticed it appears the length of the blur is connected to the distance each object is away from the centre point.

My goal is a blur of equal length on each object based on the colour of each object similar to this image produced by Motion Blur Zoom.

Is anyone able to assist or advise my on this?

I think Sallyanne is right,
cause I get this

select rectangle
new black layer
invert selection
feather selection 20 about
cut
invert selection
shrink selection 10 about
cut

Indeed she was, as are you, but I refer you to the question, that was asking about the existence of a script...

Thanks for your efforts.

To answer the question :is there a script", the Layer Effects Outer Glow can do this (more or less) except it does not work directly on a selection - you have to create a temporary layer and fill the selection then run it on that (make sure knockout is checked to delete inside) then delete the temporary layer with the filled selection.



HTH

-Rob A>

Maybe Edge Glow script is what you're looking for.

Both are great examples that I have experimented with.
Thanks.
Now if I can just work out how Motion Blur Zoom produces it's results I'll be set.