RD Curve Data Format
RD curves produced by rd_collect.sh and AreWeCompressedYet are text files with one data point per line, separated by spaces.
<quantizer> <number of pixels> <size in bytes> <psnr> <psnrhvs> <ssim> <fastssim>
Note that the units for all metric results are in dB. See the tools directory in the Daala source code for how they are calculated.