|KColorEdit is a very usefull tool for easy and fun editing and creation of color palettes.|
KColorEdit is intended be a tool for web designers, is particulary useful when editing CSS files and you want to choose the "right" color for your proyect.
Many pages have a nice design, but sometimes those pages has issues with the color scheme. For example: when you try to read the text you can't do it becouse the background. Indeed, when the text color's and background color's doesn't contrast themselves (or doesn't fit) then the eye has to be extra effort to read the text.
Image you have #fe9f10 as background color. Lets add this color to our pallete (click the plus symbol)
With KColorEdit is easy to select the "oposite" color: the (best) text color. Just set the Sheme to Complement and the task is done.
Later, you can add the text color to the palette and copy it to the clipboard: #106ffe
KColorEdit is part of KDE Extragear. The User Handbook is fairly old, but helpful.