title: Lossless RGB24 to YUV444 transformation
body: <p>I am currently attempting to undergo lossless compression of RGB24 files using H264 on FFMPEG. However, the color space transformation used in the H264 compression (RGB24 -> YUV444) has proven to be lossy (I'm guessing due to quantisation error).
  Is there anything else I can use (eg a program) to transform my RGB24 files to YUV losslessly, before compressing them with lossless H264? </p>
  
  <p>The ultimate goal is to compress an RGB24 file then decompress it, with the decompressed file exactly matching the original file. eg RGB24 -> YUV444 -> compressed YUV44 -> decompressed YUV444 -> RGB24.</p>
  
  <p>Is this at all possible?</p>