Change color intensity stroking along a path

[denzjos]

Thank you all for your information, I thought there was a script or plugin that calculated the blending between two colors along a path measured by 'path details' tool. In my previous example the result is 90242,0. Then calculate the blending between 2 colors by using this length and the amount of colors that are possible between two colors in gimp. Maybe someone find a solution for this.