Bug 359541

I have a problem with my color grading tools on Kdenlive. I'm on ubuntu 15.10 Wily with the las stable kdenlive from sunab repository.

The problem is, if I use the color grading tools, I have an anomaly and I want to know if it's a problem with my system or not. 

http://i.imgur.com/k9YSE54.png

If you look at the above picture, you can see the Cyan color on the clip monitor. The anomaly is that, the tools for color grading (the RGB parade and Vectorscope) on kdenlive indicate that the color is rather yellow : 

- RGB Parade : this tool show the red and green bars at the top, and the blue bar at the bottom : red + green = yellow
- Vectorscope : the yellow arrow in the picture, that I added to it, indicate the point printed by the vectorscope. So this point is in the yellow small circle.

Instead of this, we should have the green and blue (green + blue = cyan) at the top, and the vectorscope should indicate in the Cy small circle.

By examining this problem by varying the color in all the color spectrum and observing the vectorscope. The result of this is that, the colors in the line passing trough the green and magenta are corrects, they match what I see in the monitor clip. But if I quit the Green point in the clip monitor and want to go to the yellow color, the vectorscope will show me that I am going rather to the opposite direction, meaning to the cyan. 

After this, I installed the last unstable kdenlive from sunab, ... same result, even with the last version from official ubuntu repo, I have the same result. 



Reproducible: Always

Steps to Reproduce:
1. Add a red color clip (or other primary/secondary color) in the bin
2. Click on it to print the clip on the monitor
3. open some color grading tools, preferably "RGB Parade" and "Vectorscope"


Actual Results:  
If it is the red clip, the tools will show it as Blue color. Below you have the behaviour of the tool, depending on the color of the clip : 
- Green is presented correctly
- Blue is presented as Red
- Cyan is presented as Yellow
- Magenta is presented correctly
- Yellow is presented as Cyan

Expected Results:  
In normal way the color granding tools should indicate :
-  red as red
- Green as green 
- ... and so on

 I'm on ubuntu 15.10 Wily with the last stable kdenlive from sunab repository.
After the problem, I tried this. I installed the last unstable kdenlive from sunab, ... same result, even with the last version from official ubuntu repo, I have the same result.