HSL stands for: Hue, Saturation, Luminance.
The fact is one of the most important code in image processing is filtering, and filters comes in many forms. The following is a filter using HSL Color Space, and below shows HSL Color Space, Image after filtering with a certain values of HSL, and a method show to how to approximate the values needed for RGB filtering to detect one Faces for example.
Looking forward to see your contributions, feel free to contact me anytime :).
*HSL COLOR SPACE
*Image after filtering with a certain values of HSL
*Knowing approximate range color using Paint