2021-01-07 python opencv调节图片亮度与对比度

﹏ヽ暗。殇╰゛Y 2023-01-03 04:24 232阅读 0赞

# python opencv调节图片亮度与对比度 #

度调整是将图像像素的强度整体变大/变小，对比度调整指的是图像暗处变得更暗，亮出变得更亮，从而拓宽某个区域内的显示精度。  
**创建两个滑动条分别调整对比度和亮度（对比度范围：0 ~ 0.3， 亮度0 ~ 100）。提示：因为滑动条没有小数，所以可以设置为0 ~ 300，然后乘以0.01**

## 代码 ##

import cv2
    import numpy as np
    alpha = 0.3
    beta = 80
    img_path = "7MeansDenoising/1_1.bmp"
    img = cv2.imread(img_path)
    img2 = cv2.imread(img_path)
    def updateAlpha(x):
        global alpha, img, img2
        alpha = cv2.getTrackbarPos('Alpha', 'image')
        alpha = alpha * 0.01
        img = np.uint8(np.clip((alpha * img2 + beta), 0, 255))
    def updateBeta(x):
        global beta, img, img2
        beta = cv2.getTrackbarPos('Beta', 'image')
        img = np.uint8(np.clip((alpha * img2 + beta), 0, 255))
    # 创建窗口
    cv2.namedWindow('image')
    cv2.createTrackbar('Alpha', 'image', 0, 300, updateAlpha)
    cv2.createTrackbar('Beta', 'image', 0, 255, updateBeta)
    cv2.setTrackbarPos('Alpha', 'image', 100)
    cv2.setTrackbarPos('Beta', 'image', 10)
    while (True):
        cv2.imshow('image', img)
        if cv2.waitKey(1) == ord('q'):
            break
    cv2.destroyAllWindows()

效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpbmdmZW5neGQx_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpbmdmZW5neGQx_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpbmdmZW5neGQx_size_16_color_FFFFFF_t_70]: /images/20221119/31ae73d142804785ba0cf48484fb4fee.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpbmdmZW5neGQx_size_16_color_FFFFFF_t_70 1]: /images/20221119/bc411bff6aac49e6ab41e8dc383f1433.png