Image Sampler
An image node that allows more external control than the standard Image node. It uses the Projection nodes to determine how the image will be attached to the surface. A Projection node isn't needed for intrinsic Object UVs so the Image Sampler's Color output can be plugged straight into the Color Input on a primitive shape.
Invert Alpha inverts the alpha portions of the image so that the alpha region becomes solid and non-alpha becomes transparent.
Invert Color inverts the color of the image.
2019.1 brings separate color channel outputs to the Image Sampler node.