The hair dye market provides dye products and hair coloring AR services to consumers. The hair coloring service purposes to provide a more realistic user experience by checking in advance whether the color will suit them before consumers actually dye their hair. However, rendering malfunctions to check the final color of the real world. On this account, we propose a new color rendering processing method. The new algorithm determines the brightness of the hair area for the input image, calls the color value adjusted from the lookup table according to the determined hair brightness and reflects both brightness value and adjusted color value to the final rendering. Since the lookup table was created to reflect the actual hair dye result data, this new image processing shows a better hair color rendering result which closes to the real hair dye coloring.