I would like to create the following effect (in purple colour but that shouldn't be a problem) along the line in the second picture. The picture was created in Photoshop CC and I have placed it as a texture on a plane object in Blender. I am using the Cycles Rendering Engine and Blender v2.76.
Disclaimer: This picture is not the texture I want to apply the effect on but the real texture will be published so for copyright reasons I cannot show it here. Just so you know the actual texture was hand drawn, scanned, and processed on Photoshop CC thus the option of me redrawing it in blender with lines is not really possible.
Thank you all very much for the help in advance. :)