There is a gray card that can customize the white balance. Do I still need 24-color standard color cards? I bought a color calibrator and asked for professional color management.

You can calibrate the white balance with a gray card. Whether to use 24-color cards depends on personal needs. Some of the 24 color cards are the basic colors of nature and the standard colors of human skin color. If someone is like a natural thing, you can consider buying it. For the photography industry, color calibrator is essential.