在調用opencv的imread(filename, flags=None)函數時，后面有個flags=None參數，但打開文檔輕描淡寫，不知該參數上哪找去，用全局搜索也搜不到，莫非要到官網查？（擦汗’’）

打開官網，有個Online documentation，點它:
然后找到自己opencv版本點進去，我的是這個（如果不知道自己opencv版本可以在控制臺執行pip list查看）：


點進去后右上角搜索就ok了：

IMREAD_UNCHANGED Python: cv.IMREAD_UNCHANGED If set, return the loaded image as is (with alpha channel, otherwise it gets cropped).IMREAD_GRAYSCALE Python: cv.IMREAD_GRAYSCALE If set, always convert image to the single channel grayscale image (codec internal conversion).IMREAD_COLOR Python: cv.IMREAD_COLOR If set, always convert image to the 3 channel BGR color image.IMREAD_ANYDEPTH Python: cv.IMREAD_ANYDEPTH If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.IMREAD_ANYCOLOR Python: cv.IMREAD_ANYCOLOR If set, the image is read in any possible color format.IMREAD_LOAD_GDAL Python: cv.IMREAD_LOAD_GDAL If set, use the gdal driver for loading the image.IMREAD_REDUCED_GRAYSCALE_2 Python: cv.IMREAD_REDUCED_GRAYSCALE_2 If set, always convert image to the single channel grayscale image and the image size reduced 1/2.IMREAD_REDUCED_COLOR_2 Python: cv.IMREAD_REDUCED_COLOR_2 If set, always convert image to the 3 channel BGR color image and the image size reduced 1/2.IMREAD_REDUCED_GRAYSCALE_4 Python: cv.IMREAD_REDUCED_GRAYSCALE_4 If set, always convert image to the single channel grayscale image and the image size reduced 1/4.IMREAD_REDUCED_COLOR_4 Python: cv.IMREAD_REDUCED_COLOR_4 If set, always convert image to the 3 channel BGR color image and the image size reduced 1/4.IMREAD_REDUCED_GRAYSCALE_8 Python: cv.IMREAD_REDUCED_GRAYSCALE_8 If set, always convert image to the single channel grayscale image and the image size reduced 1/8.IMREAD_REDUCED_COLOR_8 Python: cv.IMREAD_REDUCED_COLOR_8 If set, always convert image to the 3 channel BGR color image and the image size reduced 1/8.IMREAD_IGNORE_ORIENTATION Python: cv.IMREAD_IGNORE_ORIENTATION If set, do not rotate the image according to EXIF's orientation flag.

參考文章：python opencv imread()函數 （從文件加載圖像）

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