Color Space is a technical term that is extremely important in rendering and optimizing game graphics (technical art). A basic explanation of the difference between the color expression methods (Linear and Gamma) used during Unity's rendering calculations, and physically correct light blending and HDR expression.
An analogy in the real world: Calculations using a normal ``calculator'' and scientific calculations that properly take into account ``physical formulas (squares, etc.)''
Color space is the difference between when adding up the intensities of light, whether you use a regular calculator (Gamma) or calculate after correct physical properties such as squares (Linear). Because the human eye is very sensitive to changes in dark colors, image files are saved with dark areas stretched (Gamma). If you add this up as is, it should be "1+1=2", but physically the brightness suddenly explodes as "1.5+1.5=4.5", causing overexposure and darkening. Linear space returns the data to the "original real physical light intensity" and then calculates it accurately, creating an extremely smooth and beautiful blend that looks like real light.
Figure: Infographic that clearly illustrates the basic processing flow and mechanism of Color Space (color space / color space) in Japanese notation
Detailed mechanism and operating principle
In the Player settings of Project Settings, select "Color Space” to “Linear” to perform all lighting calculations inside the GPU in physically correct linear space, and automatically apply gamma correction for display during final output.