**10. Conclusion**

Colorimetry has long been used in experimental, décor, pharmaceuticals, cosmetics, textiles, surface coatings, paper, ink, plastic, color photography, glass, and paint, as well as in biology as a health indicator and for cell and tissue examination. Color measurement is complicated by the fact that one can only 'measure' the reflection and transmission qualities of the materials that produce the color.

There are two methods that could be used: (i) color capacity of an purpose; (ii) strength quantity of reflected/communicated light at specific wavelengths The goal of this research was to create a tristimulus colorimeter with red, green, and blue leds, as well as to investigate their various uses. The architecture of the human visual system, color vision, and color vision theories are all covered in length in this chapter. We begin with an overview of color science and the internationally recommended CIE system, which serves as the foundation for colorimetric application, before moving on to color measurement instruments and color spaces used in color calculation and correction. This technique is used to quantify green active pharmaceuticals derived from natural sources.
