The image below demonstrates the effect of changing the RGB values on the SpriteA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary Renderer’s Color setting. To change a Sprite’s opacity, change the value of its Color property’s Alpha (A) channel.
SpriteRenderer