You can use your phone or camera to take a photograph of fabric to import.
When you use a scanner to set the dpi for a fabric scan, then you don’t have to worry about the scale of the fabric. With a camera or phone, the scale gets determined by the zoom of the camera and the distance of the camera from the fabric.
One way to help you determine the correct scale when you import the image is to place a ruler on the fabric and include the ruler in the photograph. Do your best to place the fabric on a flat surface with even light. Place the ruler on the fabric and take the photo. Adjust the picture so that the ruler is at the bottom.
Once the photo is transferred from your phone to your computer, use the Import Image tool to open it to the worktable. You will notice that the rulers on the worktable do not match the ruler in the photo. You may want to use Straighten along the edge of the ruler first. Then crop the sides of the fabric to the ends of the ruler. The final step is to make the rulers on the worktable and the ruler in the fabric-image match one another.
Click the Scale Fabric tool in the palette. Set the length of the ruler in the entry in the palette and click the Apply Scale button. Now your rulers match one another.
If you don’t have a ruler in the photograph, use a ruler to measure the distance on the actual fabric that matches the distance on the screen. Enter the number in the palette and click the Apply Scale button.
Once the scale has been adjusted, you can continue to crop to the pattern repeat and the scale will be maintained.