python滑块调整图片亮度和对比度

很高兴为您解答。您可以使用OpenCV库来实现Python滑块调整图片亮度和对比度。下面是Python代码示例：

import cv2
import numpy as np

def adjustBrightnessContrast(image, brightness, contrast):
    # 亮度调整
    if brightness != 0:
        if brightness > 0:
            shadow = brightness
            highLight = 255
        else:
            shadow = 0
            highLight = 255 + brightness
        alpha_b = (highLight - shadow) / 255
        gamma_b = shadow

        # 映射表
        table_b = np.array([((i / 255) * alpha_b + gamma_b) if ((i / 255) * alpha_b + gamma_b) > 0 else 0 for i in range(0, 256)]).astype("uint8")
        image = cv2.LUT(image, table_b)

    # 对比度调整
    if contrast != 0:
        f = 131 * (contrast + 127) / (127 * (131 - contrast))
        alpha_c = f
        gamma_c = 127 * (1 - f)

        # 映射表
        table_c = np.array([((i / 255) * alpha_c + gamma_c) if ((i / 255) * alpha_c + gamma_c) > 0 else 0 for i in range(0, 256)]).astype("uint8")
        image = cv2.LUT(image, table_c)

    return image

# 读取图片
img = cv2.imread('test.jpg')

# 创建窗口
cv2.namedWindow('image')

# 创建滑块
cv2.createTrackbar('Brightness', 'image', 0, 100, lambda x: None)
cv2.createTrackbar('Contrast', 'image', 0, 100, lambda x: None)

while True:
    # 获取滑块值
    brightness = cv2.getTrackbarPos('Brightness', 'image') - 50
    contrast = cv2.getTrackbarPos('Contrast', 'image') - 50

    # 调整亮度和对比度
    img_adjust = adjustBrightnessContrast(img, brightness, contrast)

    # 显示图片
    cv2.imshow('image', img_adjust)
    
    # 按下Q键退出
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# 释放窗口和摄像头
cv2.destroyAllWindows()

您可以按照上述步骤来实现Python滑块调整图片亮度和对比度。希望能对您有所帮助。