如何在GDAL Python中获得带数组的正确比例？

import gdal
import numpy as np

dataset = gdal.Open('image.tif')

width = dataset.RasterXSize
height = dataset.RasterYSize

band = dataset.GetRasterBand(1)  # 获取第一个波段
data = band.ReadAsArray(0, 0, width, height)  # 读取图像数据

min_value = np.min(data)
max_value = np.max(data)

scale_factor = (max_value - min_value) / 255.0

scaled_data = (data - min_value) / scale_factor