Photoshop

Adobe Photoshop has a great tool called the paintbrush tool. You can use the paintbrush tool to add color to your image. The brush tool applies a continuous stream of color and stops applying paint as soon as you stop dragging your mouse. The paintbrush paints a line of any size. When you click on the paintbrush tool it opens a menu which includes the brush tool, the pencil tool and the color replacement tool.