image - 如何在python中用opencv压缩png文件？

Question

我试过这个代码:

compression_params = [cv2.CV_IMWRITE_PNG_COMPRESSION, 9] 
img = cv2.imread('img1.png', cv2.IMREAD_UNCHANGED) 
cv2.imwrite('compress_img1.png', img, compression_params)

但我得到这个错误:

AttributeError: module 'cv2' has no attribute 'CV_IMWRITE_PNG_COMPRESSION'

我正在使用 python 3.5 和 opencv 3.0

Answer 1

OpenCV 3.0 中的名称是 IMWRITE_PNG_COMPRESSION (没有 CV_ 前缀)。

所以尝试:

cv2.imwrite('compress_img1.png', img,  [cv2.IMWRITE_PNG_COMPRESSION, 9])

This post还提到投到 int .我不确定这是否仍然需要:

cv2.imwrite('compress_img1.png', img,  [int(cv2.IMWRITE_PNG_COMPRESSION), 9])