When blood is shown from a "vamp's eye view" it's a much brighter red...which falls in with Trevor's original concept of vamps being color-blind except for red.
For example...blood on the floor, as Mick observes it:

A little later, Coraline sees Mick with blood on his mouth...

And try this on for size...in the hospital, a "human" view of Pollock, with dark blood hanging in the foreground:

Now, the perspective is turned around and we see through Pollock's eyes, the same bag of blood:

They don't hit you over the head with this, but it's there. For people like us to find and appreciate.
Lucky
(me? consistent? *cough*Kostan lover*cough*)