The default transparent colour in sprite editor is black with alpha 0. I'm using the Shaun Spaldings outline shader, which takes the alpha values of the adjacent texels and then draws itself with the transparent colour (black) if one of the adjacent texels has the alpha larger than 0. So if the transparent colour is black its gonna draw a black outline and if it's red, its gonna draw a red outline. The problem is, that I can't change the transparent colour from 000000 (black) to FF0000 (red). Is there any way to do this? Can I change the outline colour somehow else?