[Solved] How to convert RGB to grayscale by using color dimensions [closed]

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The converting function that you are referring to does the same – it weights the R,G and B channel values of each pixel, and takes the sum. Since OpenCV uses the BGR colorspace on reading images, your conversion function will be something like this-

def rgbToGray(img):
    grayImg = 0.0722*img(:,:,1) + 0.7152*img(:,:,2) + 0.2126*img(:,:,3)
    return grayImg

The specific weights mentioned here are taken from the ITU-R BT.709 standard used for HDTV, developed by the ATSC (https://en.wikipedia.org/wiki/Grayscale)

solved How to convert RGB to grayscale by using color dimensions [closed]