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Rulers, Guides and Grid


Rulers, Guides and Grid:
Rulers help you position images or elements precisely. When visible, rulers appear along the top and left side of the active window. Markers in the ruler display the pointer’s position when you move it. Changing the ruler origin (the (0, 0) mark on the top and left rulers) lets you measure from a specific point on the image. The ruler origin also determines the grid’s point of origin.

Guides and the grid help us position images or elements precisely. Guides appear as non-printing lines that float over the image. we move and remove guides. We also lock them so that they don’t move.

The grid is useful for laying out elements symmetrically. The grid appears by default as non-printing lines but can also be displayed as dots.


Applications of Guides and Grids:  
Selections, selection borders, and tools snap to a guide or the grid when dragged within 8 screen (not image) pixels. Guides also snap to the grid when moved. We can turn this feature on and off.
Guide spacing, along with guide and grid visibility and snapping, is specific to an image.
Grid spacing, along with guide and grid color and style, is the same for all images.
Show or hide a grid and guides:
Choose View > Show > Grid.
Choose View > Show > Guides.
Choose View > Show > Ruler.
Choose View > Extras. This command also shows or hides layer edges, selection edges, target paths, and slices.

Change a ruler’s zero origin:


Choose View > Snap To, then choose any combination of options from the sub menu. This snaps the ruler origin to guides, slices, or document bounds. We  also snap to the grid.Position the pointer over the intersection of the rulers in the upper-left corner of the window, and drag diagonally down onto the image. A set of cross hairs appears, marking the new origin on the rulers.

Place a guide:
If the rulers are not visible, choose View > Rulers.
Do one of the following to create a guide:
Choose View > New Guide. In the dialog box, select Horizontal or Vertical orientation, enter a position, and click OK.
Drag from the horizontal ruler to create a horizontal guide.
If you want to lock all guides, choose View > Lock Guides.

Remove guides from the image:

To remove a single guide, drag the guide outside the image window.
To remove all guides, choose View > Clear Guides.




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