[Bf-committers] patch #21750: Vectorscope and luma/color waveform for image view

James Ruan ruanbeihong at gmail.com
Sat Mar 27 17:46:46 CET 2010

Great! You've just did what i want and tried to do and you did it even better.
I can't wait to use it.
One suggestion only: could the calculation be done in another thread
as part of prefetch stage in sequencer?

2010/3/26, Xavier Thomas <xavier.thomas.1980 at gmail.com>:
> 2010/3/25 Paolo Ciccone <phciccone at gmail.com>:
>> Xavier, that looks very promising. For the VScope, would it be possible to
>> to have more clear demarcation of each color area? It would be also
>> helpful
>> to have the standard line for the skin tone, the single most important
>> feature of a VScope.
> For now I reproduce the look of the sequencer scopes but it is easily
> changeable. Better grid and the ability to zoom is on my todo
> Lastly, VScopes usually have a marker of some sort,
>> like a square that shows the limit of the usable range for each color.
>> Basically, when calibrating a monitor or a camera with a DSC chart your R,
>> G, B, M, C, Y would optimally "fall" within those squares. Beyond those
>> the
>> colors start getting oversaturated. Here is an example of what I mean:
>> http://paolociccone.com/TrueColor-HD250-part2.html
> In fact the corners of the exagon have similar representation to those
> squares. In the picture you linked, if you connect the squares with a
> line which color blends  between the color the squares correspond to
> (R Mg B Cy G Yl) -> you got the hexagon which serves as grid in my
> patch and in the sequencer scopes.
> Some things that might be cleared up:
> -The aspect is changed for the hexagon not be squashed -> it should be
> but I keep it for consistency with the sequencer
> -the coordinates of each points correspond to the U V chrominance
> (like in the sequencer) but I think it is more common to represent the
> chromimance using Cb Cr coodinate systems.
>> Excellent work!
>> Paolo Ciccone
> Thanks
> Xavier
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James Ruan

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