I'm using Handbrake to rip some DVDs to my 2013 iMac. From what I've read, I gain nothing by putting the Constant Quality RF to lower than 18. I set it to "High Profile" and change the default RF 20 to RF 18, increase the audio bit-rate to the max, and hit Start. Sometimes the picture quality looks the same as the DVD, but sometimes I feel like it's ~95% of the quality. I've been doing mostly films from the 1930s, and when I tried a modern DVD like Munich, I thought there was a slight noticeable difference. What would be causing the difference? Going below RF 18 can't increase the picture quality because it goes beyond the point to which the DVD is already compressed itself. I'm extremely, extremely picky and I'm probably analyzing and comparing too closely.. I can't say for certain if there actually is any quality difference in most cases, but what else could I do to guarantee the same quality as the Apple DVD Player playback? Thanks!