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How to Enlarge a Drawing Using a Grid. You don't need to be an artist to copy or enlarge any picture with great results.
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How to Enlarge a Drawing Using a Grid
Select the picture you want to enlarge.
Place a ruler along the top edge of the picture.
Make a small mark with a pencil at every 1/2 inch.
Mark the bottom edge of the picture the same way. Make sure you have the same number of marks at the top and bottom of the picture.
Connect each pencil mark at the top of the picture with a corresponding mark at the bottom using a ruler. This will make parallel lines over the picture.
Measure and mark every 1/2 inch along the side edges of the picture.
Connect the marks on each side. Your picture is now covered with squares called a grid.
Calculate how much larger you need to make your picture and how large you need to make squares on a second grid. For example, if you are doubling the picture size, squares in the second grid will be 1 inch.
Draw a second grid on a larger sheet of blank paper. Use a yardstick to make this larger grid if necessary.
Copy the picture from the first grid, square by square, by drawing it on the new, larger grid.
Reduce a picture by decreasing the size of the squares on the second grid using the same technique. If the size of the original grid is 1/2 inch and you want to make the picture half the size, make 1/4-inch squares on the second grid. Use this technique to enlarge or copy cartoon characters, coloring book pictures and lettering for signs.