Select a color for the grid from the Color menu, or Alt-click in the image window to lift a color from the image. Then decide how the grid lines look by selecting a Style option. The Dots setting is the least intrusive.
The "Gridline every" value determines the increments for the visible grid marks on screen. But the Subdivisions value sets the real grid. For example, if you request a grid mark every one inch with four subdivisions — as in Figure 2-20 — Photoshop snaps selections and layers in quarter-inch increments (one inch divided by four).
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