Object isolation The process of separating an object in a picture from its surroundings. is what the human eye and brain does instantaneously, for computers it is actually pretty hard. In ColorSwap The application produced by plexityHide.com that will help you easily change colors to choosen objects in a picture. you have excellent help in explaining to the computer what constitutes an object for your eye and brain. You will use the Fill tool and the settings within the Fill tool to walk an image from a starting point of your selection. A set of rules allowing for a percent deviation of the Hue The color without respect to saturation and lightness , Saturation The amount of white mixed in to the color and Value channels of the HSV color space is used. Even when you have this tool the computer and ColorSwap will not be able to find the object/objects in one go, unless it is very uniform in some sense. You will need do many iterations and build up many image parts to get the whole object. When you have two or more image parts that together defines your object you simply join those image parts together.
Once you have an isolated object it is very easy to change the Hue, Saturation and Value channels of the HSV color space, individually.
The hairstrap has been Object isolated
The Saturation has been increased with 33 percent
The Value has been increased 33 percent
The Hue has been changed to green, Saturation and Value is untouched.