Note the boxes in the Davinci vector scope…when you look at color grading with Davincin the boxes are angular targets for hue but also limits for saturation. They use a rule of thumb that saturation should not extend in any direction beyond a line that could be drawn between any adjacent boxes …not sure of the exact science but its a good double reference…
Found this interesting…https://www.peachpit.com/articles/article.aspx?p=2161673&seqNum=3 Also I cropped a bit close above but Davinci allows a scope for shadows mid highlights or all as well…not sure how hard this is or if it would be worth the effort
Why not ask for a 3D gamut viewer then 
On a more serious note: do you expect to do any measurement on scopes? That’s not really what they are intended for afaik. Though, the outer ring in Resolve shows some angular markings, so maybe there could be a use case for that.
@priort While comparing to Resolve can be useful, what tools would you expect to use in a photography oriented scope? Do you need such fine-grained control?
@afre
I wouldn’t say the axes and circles represent color distances well, but they do represent the color space accurately. I want to keep the markings simple and avoid excessive labeling. It’s not that hard to conclude what each circle means in the H-S vectorscope. The H-C vectorscope is a bit different. I think one label for the outermost circle should be enough.
That would make the feature easier to discover 
. I chose the current implementation because there isn’t much room in the histogram panel. If the slider is in the collapsible column, that wouldn’t be an issue.
@priort
DaVinci Resolve’s vectorscope is a U-V vectorscope. Unfortunately, there’s no way to show the same targets on the H-S and H-C vectorscopes. As for the low, mid, and high ranges, I’m not sure if the usefulness justifies the added complexity.
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What does a point on the vector scope represent? The angular and radial coordinates represent the hue and saturation (or chroma), respectively, together showing the distribution of colours.
Since we are currently given concentric circles going from 0-100°, are we to assume that for any hue (and implicit brightness), the saturation (or chroma) is normalized to each concentric circle?
OMG, YES!
Thank you!
Might just do it in Davinci and create a lut……
I don’t entirely understand what you are asking, but there is no normalization. In the H-S vectorscope, the circles represent 25, 50, 75, and 100% saturation (or 0.25, 0.5, 0.75, and 1.0 on a scale of [0-1]). On the H-C vectorscope, the circles should represent 32, 64, 96, and 128 chroma, although it is currently wrong and I need to fix it.
I may be able to plot those colors in the H-C vectorscope…
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That is okay. I don’t think it matters to most people. 
Honestly, that answer is not really helpful.
Sorry, I have to deal with more serious matters. (Usually is the case but I try to stay positive here.) I could continue this another time.
the vecorscope is a tremendous improvements, especially to achieve the skin tone. All good video editors have it, including DaVinci of course, which is one of the best.
I saw in a video that RT 5.9 should have the vectorscope built in. Super. But please, can you rotate the display so that the marker for skin tone is at about 11 o’clock and not about 2 o’clock? That would be very helpful.
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Hello sguyader,
DaVinci does not run on my Manjaro, my computer does not have an extra graphics card. I work with Kdenlive and am reasonably satisfied. Of course they also have a vectorscope.
I can rotate the vectorscope, but can you clarify how it is helpful?
Hello,
the usual arrangement is something like this (in Video-Editor Kdenlive):
and in DaVinci:
It would certainly be I very good to position the vectorscope as is standard in the industry. I am very much looking forward to the new RawTherapee.
Thanks
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Hallo Lawrence37,
I had forgotten to write the reasons you asked why to rotate it:
In all video editors the vectorscope has this position of colors and skin tone marker. If someone edits videos as well as photos, this would be a useful unification.
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Ok, so the rotation is to make it consistent with vectorscopes from other applications. The thing is, those vectorscopes are UV vectorscopes while the ones in RT are HS and HC. The HC one I will leave as-is so that the a* and b* axes point in the standard directions. The HS one, I’m not so sure. I don’t want to give the impression that it is identical to the UV vectorscope.