A photoshop question
Discussion
Another option would be to select the 2 white bands with the magic wand, then go path > make work path.
Once the path is made and active, you can stroke the path white or blue with the paint brush and control the size of the stroke depending on brush size.
It can be done on it's own layer too.
Once the path is made and active, you can stroke the path white or blue with the paint brush and control the size of the stroke depending on brush size.
It can be done on it's own layer too.
Did you mean something like this?

Open the image... Select/Colour Range... Set fuzziness to about 100... Select the blue with the dropper... CTRL+V to make the selection a new layer... Reduce the size of the layer slightly to move it away from the edges of the image (use the bounding box corners holding shift as you drag to keep shape)... Delete/hide the original image layer (you dont need it) so you have a plain white background layer underneath the new blue rings layer...

... Right click on the layer icon and Select Pixels... goto Select/Refine Edge... Shift Edge to approx -75%... Adjust feather to approx 10px and OK that... Make the selection a Layer Mask by pressing the icon at the bottom of the layers tab...
Gausian Blur would maybe do something similar but might not give the desired effect, plus it's destructive. The method above can be toggled between the original and smooth edges, plus you can just remake the mask if you decide you want to alter the effect.
Open the image... Select/Colour Range... Set fuzziness to about 100... Select the blue with the dropper... CTRL+V to make the selection a new layer... Reduce the size of the layer slightly to move it away from the edges of the image (use the bounding box corners holding shift as you drag to keep shape)... Delete/hide the original image layer (you dont need it) so you have a plain white background layer underneath the new blue rings layer...
... Right click on the layer icon and Select Pixels... goto Select/Refine Edge... Shift Edge to approx -75%... Adjust feather to approx 10px and OK that... Make the selection a Layer Mask by pressing the icon at the bottom of the layers tab...
Gausian Blur would maybe do something similar but might not give the desired effect, plus it's destructive. The method above can be toggled between the original and smooth edges, plus you can just remake the mask if you decide you want to alter the effect.
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