I want to have my material base colour a transparent to let the image below show through. At the moment highlited with pink circles the colour is black. I am adding an image texture to the material which i want to be visible. Is this possible?
To get rid of the background color, you can set up your nodes like this:
This will work if you have an alpha channel in your png. Otherwise, you can do something like this to remove the black from the image:
This will make everything with a value of less than 0.001 (in other words black) transparent. If you are using eevee, you will have to change the blend mode to alpha blend and uncheck "Show Backface" in the material settings to make things actually transparent:
Hope this helps!