Chromatic Aberration (Chromatic Aberration) is a technical term that is extremely important in the rendering and optimization of game graphics (technical art). An explanation of post effects that simulate the shift in light wavelength due to physical camera lens defects and slightly shift the red, green, and blue (RGB) color channels at the four corners of the screen to create a realistic lens feel and the effects of sci-fi bugs and shock waves.
Real-world analogy: When light passes through a prism, the red and blue ink (color channels) are slightly ``printed out of alignment'' in a retro three-color print
Chromatic aberration is a physical defect phenomenon in which when you look into the rim of an inexpensive camera lens or glass cup in the real world, the rim becomes a beautiful rainbow color due to the difference in the refractive index of each wavelength of light (red, green, blue). By deliberately adding this ``discrepancy'' to the digital 3D screen, the coldness of CG completely disappears, and intense sci-fi effects such as ``a reality as if shot through a camera lens'' and ``the electronic noise (bug) of a hologram'' are instantly created.
Illustration: Chromatic Aberration (Infographic that clearly illustrates the basic processing flow and mechanism of chromatic aberration) in Japanese notation
Detailed mechanism and operating principle
Add "Chromatic Aberration" to the Post Processing volume and adjust the intensity to create exquisite RGB red and blue "bleeding/slip" on the black and white border of the screen.