Vignette (Vignette) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). A post-processing effect that reproduces the lens effect of a toy camera by gradually darkening the four corners of the screen (the outer periphery) or reducing the transparency by dimming the light and focusing the player's gaze on the characters and important objects in the center of the screen.
Real-world analogy: On a movie theater screen, cover the excess surrounding frame with a little black cloth to attract the audience's eyes to the main character in the center. Gaze-guiding magic
Vignette is an "emotional production technique that re-imports the phenomenon of dark, blurry corners in old film cameras (such as toy cameras) caused by defects in the physical lenses of old film cameras (toy cameras, etc.) as a stylish picture frame (mask)". By simply casting a slight gradation shadow in the corner of the screen, the entire screen will tighten up and the player's eyes will naturally focus on the main character in the center. Additionally, when receiving damage from an enemy, the shadows in the four corners are ``dyed red and pulsate'', which is widely used as a method to create a sense of urgency in a near-death situation.
Figure: An infographic that clearly illustrates the basic processing flow and mechanism of Vignette (Vignette) in Japanese notation
Detailed mechanism and operating principle
Add "Vignette" to the Post Processing volume, set the Mode to "Classic", and use the sliders to fine-tune the strength and smoothness of the black shadows (gradation mask) that cover the four corners.