What are the RGB values of red, orange, yellow, green, indigo and purple?

To understand the digital characteristics of color in digital photography, we must understand the following concepts:

1, three primary colors, RGB. There is a theory that all colors seen by human eyes are a mixture of three primary colors: red, green and blue. This theory has been well verified in reality, so it is widely used. In the digital world, this method is also widely used to represent colors: a specific color is represented by the combination of different brightness values of red (R), green (G) and blue (B). Each single color value represents the brightness of the color, with 0 being the darkest, and the higher the value, the brighter it is. So different values of r, such as (r, 0, 0), such as 255 represents pure red with a certain brightness, (0, g, 0) represents green, and (0, 0, b) represents blue. (r, g, 0) is some kind of orange or yellow. RGB numerical values represent colors, which is the most basic and widely used method to record colors in digital photography.

2.HSB said. Color can also be defined by hue, brightness value and saturation. Hue refers to the external expression of color, that is, the colors perceived by human eyes through a certain wavelength of light, such as red and yellow. Saturation (chroma) refers to the purity or concentration of color. Adjustment operations in image processing software, such as color selection, are relatively intuitive because HSB describes color images, so it is generally used to describe functions, but RGB is still used for data recording.