The registered photo has a blue background, and the background blue value is R:67 G: 142 B:2 19, which is the default mode of normal development.

There are two common background colors for color ID photos: RGB and CMYK.

We usually use the default RGB mode for developing photography, and only the photo printing industry uses CMYK mode.

Note: If you are taking pictures, try not to wear dark clothes.

The background of a photo is not necessarily a number.

But generally speaking, color photos have two modes, RGB and CMYK. If it is blue: R:0 G: 19 1 B:243 or C:67%? Male: 2% female: 0% male: 0%. If red is used, the value can be set to: R:255 G:0 B:0 or C:0 M:99 Y: 100 K:0.