colors in pdf file not shown correctly in illustrator
Hi everyone, I am using illustrator to do rendering for my research's result figures. The thing is, the color of my pdf file doesn't show correctly, always blur in the picture

However, it can show pretty well in file reader

the figure is plotted in a software widely used in geophysics(gmt), and I can find some info there.
The figure is a 16colors, 4 bits depth, some settings in this software goes here:

anyone please tell me how to import it rightly in illustrator? thanks
