SCNView and SKView showing different colors

An SCNNode is created and used for either an SCNView or an SKView. SceneKit and SpriteKit are using default values. The SceneView has an SCNScene with a rootNode of the SCNNode. The SpriteKitView has a SpriteKitScene with an SK3DNode that has an SCNScene with a rootNode of the SCNNode.

There is no other code changing or adding values.

Why are the colors for the SCNView less vibrant than the colors for the SKView? Is there a default to change to make them equivalent, or another value to add? I have tried changing the default SCNMaterial but only succeeded in making the image black or dark.

Any help is appreciated.