Nine Brightness Degrees Tone Color Picture

Quick answer：

The 'Nine Brightness Degrees Tone Color Picture' refers to a collection of images or artistic works that depict a range of colors corresponding to the Chinese musical concept of 'Nine Brightness Degrees'. This concept is part of the ancient Chinese musical scale and was used to categorize pitch in the traditional Chinese music. Each degree is associated with a specific pitch, and the pictures might visually represent these tones or scales.