1. 半音(阶)的
In music, chromatic means related to the scale that consists only of semitones.

2. 色彩的
Chromatic means related to colours.

1. being or having or characterized by hue

2. based on a scale consisting of 12 semitones

e.g. a chromatic scale

3. able to refract light without spectral color separation

e.g. chromatic lens