I am trying pdal to perform a ground filtering on a point cloud (las file) with colors. I use the pcl option and this tutorial Identifying ground returns using ProgressiveMorphologicalFilter segmentation
pdal pcl -i input.las -o output.las -p sor-pmf.json --visualize -v4
However, the result I get is without colors. How can I prevent this from happening? I tried pdal info and there are no RGB values.