Ok so im pretty sure this is how it works, but couldnt find any specific resource that says it so wanted to confirm it.
, theres a green line going perpendicular from the red and blue thats a little hard to see in this picture

Blue:pixel_z, positive move up (northwestish for isometric)
Red:pizel_x, positive moves southeast(east for isometric)
Green:pixel_y, positive moves northeast(north for isometric)

And the intersect point on the picture is the the 0,0,0 point correct? Just want to confirm thats how it works.