The Background Color information is stored for image and photo files that have a color specified for the image background. The background color is, in most cases, displayed in the form of an RGB triplet or a hexadecimal code.
The three separate pairs of numbers you are given represent the different color values of the RGB spectrum. The first value stands for the red color, the second for the green color and the last for the blue color. These three values can be converted into a hexadecimal code that can also be used to specify colors either on the web (in HTML and CSS) or in a graphic program. For example, the RBG triplet of the Get-Metadata color is RGB(83, 57, 124) and represents the hexadecimal format of #53397C.