Auto color in manga can be achieved through certain apps or plugins. For instance, there are plugins available for common graphic design software that offer auto color options. But keep in mind, the results might need some manual adjustments for better quality.
The auto color bot in manga has its pros and cons. It's good at quickly adding colors, but it might not always match the artist's vision precisely. It's best used as a starting point that might need some manual adjustments for perfect results.