Reading the code I found that SIGBITS is used when it gains a compression ratio of 1.6:1 while RLE is required to get 4:1 ratio (but the comment talk about a 4:1 for both). How were the ratios decided ? https://github.com/pgpointcloud/pointcloud/blob/v0.1.0/lib/pc_dimstats.c#L121-L137 --strk;