def convert_images_to_pil(self, images, dither, nq=0, images_info=None):
        """ convert_images_to_pil(images, nq=0)

        Convert images to Paletted PIL images, which can then be
        written to a single animaged GIF.

        """

        # Convert to PIL images
        images2 = []
        for im in images:
            if isinstance(im, Image.Image):
                images2.append(im)
            elif np and isinstance(im, np.ndarray):
                if im.ndim == 3 and im.shape[2] == 3:
                    im = Image.fromarray(im, 'RGB')
                elif im.ndim == 3 and im.shape[2] == 4:
                    # im = Image.fromarray(im[:,:,:3],'RGB')
                    self.transparency = True
                    im = Image.fromarray(im[:, :, :4], 'RGBA')
                elif im.ndim == 2:
                    im = Image.fromarray(im, 'L')
                images2.append(im)

        # Convert to paletted PIL images
        images, images2 = images2, []
        if nq >= 1:
            # NeuQuant algorithm
            for im in images:
                im = im.convert("RGBA")  # NQ assumes RGBA
                nq_instance = NeuQuant(im, int(nq))  # Learn colors from image
                if dither:
                    im = im.convert("RGB").quantize(palette=nq_instance.palette_image(), colors=255)
                else:
                    im = nq_instance.quantize(im, colors=255)  # Use to quantize the image itself

                self.transparency = True  # since NQ assumes transparency
                if self.transparency:
                    alpha = im.split()[3]
                    mask = Image.eval(alpha, lambda a: 255 if a <= 128 else 0)
                    im.paste(255, mask=mask)
                images2.append(im)
        else:
            # for index,im in enumerate(images):
            for i in range(len(images)):
                im = images[i].convert('RGB').convert('P', palette=Image.ADAPTIVE, dither=dither, colors=255)
                if self.transparency:
                    alpha = images[i].split()[3]
                    mask = Image.eval(alpha, lambda a: 255 if a <= 128 else 0)
                    im.paste(255, mask=mask)
                images2.append(im)

        # Done
        return images2