A series of gradient maps to help quicken the process of rendering materials without losing your marbles on the myriad of colors you have to pick from a single reference image and specific settings.
A "small" set of gradients that have helped me color metallics over the years! Just shade your desired drawing in basic black and white values, then go to Edit>Tonal Correction>Gradient Maps and select the gradient you desire.

* NOTE: Gradient Maps replace values with the colors assigned in the slider from darkest (left side) to lightest (right side), so be mindful of how balanced your values are in the moment of shading, else you won't be able to get the full spectrum of color on the chosen gradient. It helps to simply use a dark gray, gray, and white color to shade with.

