Please forgive me if I used beginner terminology.
I would like to have a bottle in color "provided by the simple diffuse shader" (ie. with pure red). I would like to put a test texture (222222 on the screenshoot) only on part of bottle which was UV unwraped (only box with 22222 has been cover by unwrapped faces).
I know how to do this with image with transparency (alpha) as decals however the question is if there is any simple option just to put part of texture on object and leave the rest with pure shader without texture?
I've found on blender manual that if I set texture as "clip" it will set exterior pixels as "transparent black". No idea what transparent black means, but it is not transparent.
The mix node always mixes the rest of bottle with texture and does not give pure color (red). I tried to put an alpha texture node into mix factor to separate the texture part from rest (as manual states remaining pixels are transparent "black") but the result is well..bad.
I would appreciate your support. No idea where is my mistake.