Grid
The default color and spacing of the vertical and horizontal rulings for the Grid tool can be set with the controls in the Grid area of the Preferences window. When the Color button is clicked, the System Color Picker window appears. Select the color for the grid lines and click on the OK button. On the Macintosh the System Color Picker also allows setting the transparency of the grid using the slider at the bottom of the Color Picker. Both the horizontal and vertical rulings will be set to this color.
The spacing between the grid lines is controlled in two ways in the Preferences window. The first is to type a number in the Width and Height fields. This sets the grid spacing, in pixels, from a mini- mum spacing of 3 pixels to a maximum spacing of 500 pixels (the default is set to a 50 x 50 pixel grid spacing).
The grid spacing may also be set by clicking on the up and down arrow buttons next to the Width and Height fields. Each click will add or subtract 1 pixel from the respective spacing value.
If the grid spacings are changed manually
Guides
Guides are reference lines added to the preview image to aid in alignment of the elements on a set or to assist in adjusting the camera settings for tilt, swing, shift, etc. The default color and line style for the grid lines can be set with the Guides controls. When the Color button is clicked, the System Color Picker window appears. Select the color for the guide lines and click the OK button.
The line style for the guides can be selected as solid, dashed, dotted or stippled. The line style and color are applied to both horizontal and vertical guide lines.
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