message: EXR reading: support Z channel if no Y channel
diff: @@ -156,6 +156,10 @@ bool ExrDecoder::readHeader()
  else
  {
  m_green = channels.findChannel( "Y" );
  + if( !m_green )
  + {
  + m_green = channels.findChannel( "Z" ); // Distance of the front of a sample from the viewer
  + }
  if( m_green )
  {
  m_ischroma = true;
  