HTML Color Names
#/RGB to CMYK
RGB to HSV
In testing this Function works well in
This is a new feature in HTML5, and will probably become the standard color-picker in the future.
Select a color:
Here is the code: <input type="color">
You can add the rest of the code needed for your form,
i.e: <input type="color" id="colorname" size="20">
Pretty simple and works well. but using this will limit your visitors for now until it becomes standard.
You might also need to use a RGB convertor for this,
(R=red G=Green B=blue to #COLOR)
Please see our converter HERE