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I don't use Java, but c1c2c3 conversion is a simple 2 liner in python openCV. This is what I use for a 24 bit image stored in img obtained, for example, by img = cv2.imread("image.jpg") im = img.astype(np.float32)+0.001 #to avoid division by 0 c1c2c3 = np.arctan(im/np.dstack((cv2.max(im[...,1], im[...,2]), cv2.max(im[...,0], im[...,2]), cv2.max(im[...,0], im[...,1]))))

I don't use Java, but c1c2c3 conversion is a simple 2 liner in python openCV. This is what I use for a 24 bit image stored in img obtained, for example, by img = cv2.imread("image.jpg") cv2.imread("image.jpg")

im = img.astype(np.float32)+0.001 #to avoid division by 0
 c1c2c3 = np.arctan(im/np.dstack((cv2.max(im[...,1], im[...,2]), cv2.max(im[...,0], im[...,2]), cv2.max(im[...,0], im[...,1]))))
im[...,1]))))