<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def palette(self, label_im):
        '''
        Transfer the VOC color palette to an output mask for visualization.
        '''
        if label_im.ndim == 3:
            label_im = label_im[0]
        label = Image.fromarray(label_im, mode='P')
        label.palette = copy.copy(self.palette)
        return label