Bloom (Bloom / leaked light) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). A post-processing technology that extracts high-brightness pixels on the screen (such as dazzling light sources with an HDR value of 1.0 or higher) and synthesizes beautiful light blurring and leakage around them using Gaussian blur to make them appear truly dazzling.
Real-world analogy: When you watch "Dazzling Psyllium" in a dark live music venue, the dust in the surrounding air reflects and the light appears blurry and blurry, an emotional optical illusion.
Bloom is a post effect that reproduces the phenomenon in which when we look at the moon or laser beams (high-brightness pixels) in the night sky, the light is diffusely reflected in our eyes and camera lenses, and ``a soft aura of light leaks out into the surrounding area'' beyond the outline.'' Although the monitor itself cannot emit real, physical, dazzling light like the sun, by compositing this blur picture (Bloom) around the light on the screen, the player's brain gets the illusion that ``real, intense, dazzling light is there,'' and they perceive an overwhelming visual beauty.
Figure: An infographic that clearly illustrates the basic processing flow and mechanism of Bloom (Bloom / Leak Light) in Japanese notation
Detailed mechanism and operating principle
After applying Post Processing to the camera, add "Bloom" to the Global Volume, and adjust the Threshold and Intensity to blur the light in bright areas.