如何在python中使用opencv压缩png文件？ [英] How to compress png file with opencv in python?

问题描述

我试过这段代码：

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

但是我得到了这个错误：

But I obtain this error:

AttributeError：module'cv2'没有属性'CV_IMWRITE_PNG_COMPRESSION'

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

我正在使用python 3.5和opencv 3.0

I'm working with python 3.5 and opencv 3.0

推荐答案

OpenCV 3.0中的名称是 IMWRITE_PNG_COMPRESSION （不含 CV _ 前缀）。

The name in OpenCV 3.0 is IMWRITE_PNG_COMPRESSION (without the CV_ prefix).

所以试试：

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

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这篇文章还提到要转换为 int 。我不确定是否还需要这个：

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This post mentions also to cast to int. I'm not sure if this is still needed:

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

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