Measurement of value is from black to white. The range from black to white is called value. Contrast is the degree of separation between values. Whereas brightness adds white to an image, the lack of brightness tones the image. No saturation on top, to full saturation on the bottom.
Saturation is the measurement of color intensity.
The lack of saturation should remind you of black and white television. Just don't worry. Pick whatever method works for you, but I urge you to try for the latter as nothing beats real or cyber world experience.