[Kdenlive-devel] Color correction tools: How and where to implement them?

[Simon Eugster]

2010/7/14 Till Theato <root at ttill.de>:
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> On 07/14/2010 07:13 PM, Dan Dennedy wrote:
>> On Wed, Jul 14, 2010 at 9:00 AM, Simon Eugster <simon.eu at gmail.com> wrote:
>>>>> * 3-Way color correction works basically quite well,
>>>>>   but the usability is terrible.
>>>>>   If you want to change the blacks, you have to rise the black
>>>>>   value to see colors in the color picker, and at the end make
>>>>>   it nearly black again. Would be much better to just chose a
>>>>>   color and not having to worry about black.
>>>>>   Also is it not very convenient not to have a live preview.
>>>>
>>>> All Kdenlive effects have live preview. So, a simple enhancement to
>>>> toggle that would help.
>>>
>>> Well, there is live preview as soon as the color has changed in the
>>> widget. But this is only the case when the color picker has been
>>> closed already. There should be a built-in color picker.
>>
>> Yeah, like I suggested for white balance.
>>
>
> I will take a look at this one. Maybe we could also reuse a color
> selector from krita.

Perhaps something like the HSV color wheel here
http://en.wikipedia.org/wiki/Color_wheel would be good because even
for high black values you still see the color.

Perhaps a wheel that just ignores the black value (like a YUV wheel
with fixed Y) would suit even better. Especially as the vectorscope
uses YUV as well, this would make color corrections much easier. I'm
currently trying (or, intending to try, should be learning actually)
to produce a YUV circle for the vectorscope as background, but this
could also be used for a color wheel later. When I get it, this
shouldn't even be too difficult.
Perhaps we'd still need to add the Y component separately.

Simon