Regardless of whether the key is greater or lesser and according to the part of the scale in which the gray we use are, it can be high when we use gray between white and gray 3. Intermediate, when we are between gray 4 and gray 6, and low when we are between gray 7 and black.

From all of the above it follows that a drawing or painting in general can be valued in high, intermediate or low major code, and high, intermediate or low minor code.