The command adds a guide to the image.
               
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            작은 정보 | 
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               You can add guides to the image more quickly, but less accurately, by simply clicking and dragging guides from the image rulers and positioning them where you would like.  | 
          
When you select , a dialog opens, which allows you to set the Direction and Position, in pixels, of the new guide more precisely than by using click-and-drag.
You can choose the Direction of the guide, either Horizontal or Vertical, by using the drop-down list.
The coordinate origin for the Position is the upper left corner of the canvas.