Guides can help us to position things within an image. A grid is another way to visualize placement. In fact, an image always has a grid, but it’s hidden by default. You can permanently change this setting, as described in Chapter 22. You can make the grid visible by using Image: View > Show Grid. Figure 10-12 shows the result. Note that this image is displayed with a zoom factor of 100%.
This grid has a mesh size of 10 × 10 pixels. When Image: View > Snap to Grid is checked, the mouse pointer always snaps to the intersection of two lines, even if it appears to be somewhere inside the mesh, as shown in Figure 10-13. You can see that the coordinates displayed in the status bar are both multiples of 10.
Figure 10-14. The Configure Image ...