In textures sometimes doing a good level of alpha padding can be a challenge especially in small detail vegetation. A Common solution many artists use is to add solidify or dilation filters adding edge padding using the color of the edge.
In this study we are going to look at eliminating artifacts in the mipmap chain around the edges by using a black color background in RGB channels as a black pixel will be mostly discarded by Unity mipmap chain and not blended, where as a white background would be blended by unity causing discoloration artifacts during blending minification.
For that purpouse Alexander Elert develop this simple Substance Designer tool for easly fix that issue in your textures. Also for your better understandment of how it works some description of what each nodes does. Download it for free.