Transparent Lines

Step 1: Start off with an image you would like to add the transparent bar to.
Step 2: Use the arrow () and click on one side of the picture and drag it across and down. This will make the selection to where you are placing your transparent line.
Step 3: Once the selection is made, go to Selection >> Invert so it's not surronding where you want your transparency, but instead only selecting where it will be.
Step 4: Right click in the selection and choose Stroke and Fill.
Step 5: You can choose if you would like a stroke, which will be a line around the color of your bar. To choose the color of the bar, simply choose the color of Fill. I use white for tranparent bars.
Step 6: Now change the opacity to 50% and hit preview. If you like it, click OK and you are done. If you do not like it, play around with the settings and keep hitting Preview until you have what you want.

That's all for your transparent line!