A color with RGB values of (12, 213, 17) will be mostly blue

Explanation

RGB values represent the intensity of Red, Green, and Blue light in an additive color model, where each component is an integer ranging from 0 (no intensity) to 255 (full intensity). Here, red (12) and blue (17) are low while green (213) is high, so the resulting color is a vivid green (in hexadecimal notation, #0CD511). The order is always R, G, B, so swapping the components to (17, 12, 213) would indeed produce a mostly blue color.