plt.imshow()显示灰度图色差问题，图片绿油油的

import pywt
import numpy as np
from cv2 import cv2
import matplotlib.pyplot as pltimg = cv2.imread("lenags15.bmp", 0)
w = 'sym4'  # 定义小波基的类型
l = 3  # 变换层次为3
coeffs = pywt.wavedec2(data=img, wavelet=w, level=l)
threshold = 0.04  # 设置滤波阈值
denoised_img = pywt.waverec2(coeffs, 'sym4' ,mode="sym")denoised_img = denoised_img.astype(np.uint8)  #把浮点数转为8位整型plt.imshow(denoised_img)     #显示图片

      结果如下

原因

      显示灰度图时 plt.imshow(dataArray) 要指定一个参数 cmap='gray'

# plt.imshow(denoised_img)     #显示图片plt.imshow(denoised_img,cmap='gray')

      结果如下