2 Replies Latest reply: Mar 3, 2014 5:52 PM by JSS1138 RSS

    Scopes question Waveform & RGB Parade

    ALLENT Community Member

      Just beginning my quest with color correction (sorry if this is a stupid question)!, but I am getting confused on reading these two scopes in SG (2 scope mode).  When I look on the Waveform it doesn't show my shadows being below 0, but when I look on the RGB Parade I see blue and red dipping below the 0 line (kind of "off the scope").  Do these scopes read differently (does Waveform just flatten out at 0, where RGB shows below the line).  What is the correct way?  Should I have nothing below the line (sometimes I like the look of the blacks looking really smooth (like black ink), and when I notice this I am sitting at 0 or below.  Is that OK...?  Or do I need to never be below the line?? 

        • 1. Re: Scopes question Waveform & RGB Parade
          R Neil Haugen Community Member

          The Speedgrade scopes are in a "floating point" method of operation, which cause some (to some of us) odd appearances of data on the scopes. I've had why this is so and why it is best explained to me, and ... yea, I can see the point theoretically ... but my brain doesn't work that way when I'm editing/grading. So ... one can get this sort of thing happening where two scopes don't "seem" to align or show the same thing but supposedly they actually are ... just from a different perspective than each other or me for that matter.

           

          I don't know if that is precisely why you're getting this particular reading at that moment of your footage ... posting a screen-grab here would of course help some of the masters around here (I'm certainly not!) give you a better answer. Listing what your computer specs and exact versions of Sg and what footage/codecs you are using would be helpful also.

           

          Neil

          • 2. Re: Scopes question Waveform & RGB Parade
            JSS1138 CommunityMVP

            My guess is the discrepancy you're seeing is the Luma signal doesn't go below 0, but the color signals do.  (I assume your media is YUV, not genuine RGB?)