Color Curve Editor
The Color Curve Editor panel is used to edit color curve.
Color curve is like 4 dimensional parameter with components R,G,B and A, so that the editor resembles to Graph Editor, but it have several extentions to handle color curve.
Header
The header contains various menus and controls.
Edit
Menu for copy & paste for entire color curve.
Key
Menu for copy & paste, and delete selected key(s).
Main panel
Selection of active parameter
Active color curve is shown on the upper left corner of the panel.
The acctive color curve can be selected by two way.
One is by clicking triangle and show selection menu, and select object and color curve.
Another way is to click colorcurve on Property panel.
Sliders
Unit of index
The color clurve is mapped to [0,1] internally, and remapped to the [min, max] parameter.
You can change type of tics from normalized one to remapped one by clicking selector icon. 
Color curve sample
Color curve has color (RGB) and transparency information (A or alpha). Alpha = 0 means utterly transparent unseen color.
You transparency is represented by checkered pattern. You can change whether or not to show transparency in sample bar by clicking RGB/RGBA icon.
Lock
Works similarly to that in Graph Editor Panel.
Controll
Control panel in Color Curve Editor resembles that in Graph Editor, but some difference exists.
Rescale button set Y range to be [0-1], (while this buttom in Graph Editor rescale to the range between minimum and maximum value).
Color Picker
Color picker button shows color at current index. Clicking this button, you can open color picker dialong (Default dialog given by OS).
Key would be automatically inserted.
Flip Color
Flip the direction of color curve.
Swap RGB
Swap the RGB Channles. For example, Green-Red curve becomes Blue-Green curve.
Numerical Panel
Range of color curve
One of the important difference between color curve and other parameters in Graph Editor is Min/Max parameter.
This parameter remaps color curve in the range [0-1] to arbitrary range.
For example, if some particle data has temperature up to 1e6 and color should be maped to that range, set max range to 1e6.
template
You can set color curve from templates. Currently, templates are fixed and can no be edited or registered.
alpha
When checked, alpha in the color curve template would be used.
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