While Lightroom’s effects panel only contains two primary options, they each play a significant role in giving your photos a unique style. This video provides a detailed explanation of how to add vignette and grain to a photo.
Vignette and grain are two options you need to consider carefully when developing your style. It seems that with these adjustments, photographers either love them or hate them. If you are one who values these two effects, it is essential that you learn to do them well. In this video from Lucy Martin, she will explain what each slider in the effects panel does and how to properly use them.
For her example, Martin uses a photo that she wants to give a vintage vibe. After color correcting the picture, she turns to the effects panel to create the look she desired. First, Martin applies a vignette, but she goes beyond merely increasing the slider's amount. She uses each option to demonstrate the control that Lightroom gives you and adjusts the shape, midpoint, and feather of the vignette. She then adds grain, while explaining what type of grain to use for different editing styles. Lastly, she takes the image into Photoshop to add a dust filter to bring home the vision she had of a vintage photo.
If you need to learn how to control the vignette and grain of an image to match your style, the video above explains this well.