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I get the following error when changing the colormap to JET following this link:

Initialising Winsock...Initialised.
OpenCV Error: Bad argument (cv::ColorMap only supports source images of type CV_8UC1 or CV_8UC3) in cv::colormap::ColorMap::operator (), file C:\build\master_winpack-build-win64-vc14\opencv\modules\imgproc\src\colormap.cpp, line 501

xyzMap = Mat(xyzBuffer, true).reshape(3, depth_image.rows);
namedWindow("xyz map", WINDOW_AUTOSIZE);
namedWindow("xyz map", WINDOW_AUTOSIZE);
Mat xyzMap_cm;
applyColorMap(xyzMap, xyzMap_cm, COLORMAP_JET);
imshow("xyz map", xyzMap_cm);