This command allows you to select a specified color or range of colors. If you want to replace a selection, remember to deselect all before applying the command.

Motion Blur blurs in a direction and specified intensity. This makes it seem like either there was camera shake or the object was moving too quick for the camera to capture as a still.

A layer mask is used to hide portions of a layer and reveal portions of whatever layer is below it. You can modify the mask by using the brush tool and painting in either black or white.