This function allows colorizing a gray image.
You can assign a color gradient to a gray bar. The color fields lying in between control the color gradient. You can drag the color fields freely and change the color gradient this way. If you drag a color field to the top or bottom, it will be deleted. If you click beside a color field, a new one will be created. By double clicking a color field, you can change its color.
The combo box below that allows choosing a color space. The HIS color space usually creates more colorful gradients.