Question answered by technical help staff. For anyone else who is ineterested: For the texture_cooccur_doit routine, there is an undocumented keyword called "g_levels" that should get you where you need to go. It looks like you can specify any value you want (the g_levels value must be between 1 and 256), so it's actually a lot more flexible than the GUI version. A brief example looks like this: envi_doit, 'texture_cooccur_doit', $ fid=fid, pos=pos, dims=dims, $ method=method, kx=5, ky=5, $ direction=direction, $ out_name=out_name, r_fid=r_fid, $ g_levels=64