IPF750 not printing b&w as wanted

[Hyacco]

Hello,

My IPF750 plotter is not printing b&w photos as desired.

I would like to know how to get a graphite tone in my photo printings.

Selecting "no color correction¨, "color" or "monochromatic" doesnt solve this problem (they are all the same in this case).

This is what i want:

This is what i get:

Thanks!

Greetings from Uruguay.

Santiago.

[Hyacco]

Any ideas?