I see. You will need to sample it onto the surface before you can use mris_divide_parcellation.
cheers Bruce
On Tue, 11 Dec 2018, Maedeh Khalilian wrote:
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Dear Bruce The parcellation I have is not on surface, it is volumetric. I wanna increase the number of its ROIs, I thought maybe I can change it into an annotation file and then use "mris_divide_parcellation". Hope it is clear enough now. Best Maedeh