Archive:Kdenlive/Manual/Effects/Misc/Vectorscope
Analysis and Data - Vectorscope
This is the frei0r.vectorscope plugin.
Not to be confused with View>Vectorscope described on Granjow's blog
In ver 17.04 this is found in the Analysis and Data category of Effects.
It is recommended to use the vectorscope from View>Vectorscope, because the effect Analysis and Data - Vectorscope is not correct - it uses a graticule from an analog NTSC vectorscope, but equations from digital video (Source: this forum post.)