OpenCV - How to see which algorithm is used behind a function? (imread)-CodePudding

The

You can then google search it, and the first result will bring you to the source code. In the source code, you can Ctrl F specific keywords, in this case, entering IMREAD_GRAYSCALE into the search box, to find the specific part of the source code.

ImreadModes

Source code links that might be what you're looking for:

https://github.com/opencv/opencv/blob/master/modules/imgcodecs/include/opencv2/imgcodecs.hpp
https://github.com/opencv/opencv/blob/master/modules/core/include/opencv2/core.hpp
https://github.com/opencv/opencv/blob/master/modules/imgcodecs/src/loadsave.cpp

CodePudding user response：

in OpenCV documentation you can find:

IMREAD_GRAYSCALE = 0, //!< If set, always convert image to the single channel grayscale image (codec internal conversion).

Also

When using IMREAD_GRAYSCALE, the codec's internal grayscale conversion will be used, if available. Results may differ to the output of cvtColor()

So it depends on codec's internal grayscale conversion

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