After using the Define Pattern command in Photoshop, you can then fill a selected area with that pattern. However, if the area to be filled is larger than the pattern itself, Photoshop “tiles” that area with repeated copies of the pattern. If the pattern doesn’t match up perfectly, the resulting seams between the tiles are clearly visible. In order to avoid the seams—to create a seamless fill—you can create a seamless pattern in Illustrator by following the directions below.

STEP 1: Preliminaries
A: In Illustrator, pull down the View menu. If there is already a checkmark in front of Snap to Point, do nothing. If not, move your cursor over Snap to Point and release. This should put the checkmark there.
B: If you do not already have a new, blank document, pull down the File menu to New to create one (Command-N).
C: Select the Rectangle tool in the Toolbox, move the cursor into the drawing area, and click once. In the dialog box that follows, enter 1.5 inches (108 points) for both the Width and the Height and 0 inches (0 points) for the Corner radius. Click OK. The resulting square will be the “bounding square” for your pattern
• NOTE: Although we used a 1.5 inch square, you can use any size rectangle for the bounding rectangle.
D: Using the Paint Style Window, make certain that both the Fill and the Stroke of this bounding square are set to None.

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