Howdy-
Thank you for your reply, it helps me a lot. Actually, I noticed that the color in high-level journals is often low saturation and soft. However, the colorbars provided by afni have a high saturation, which makes the image dazzling. So I extracted the color of high-level journals and customized the color bar with low saturation. And I think it may look better to make such a picture. If afni can provide some lower saturation or better colorbars in the future, I think I will be happy to use it.