new use for scaners tip

hi , i was trying to scan a piece of material as ref for chap to show the cammo pattern 1 to 1 , so i tried a new way , i placed a rule along the longest side of the scanner bed plate face down , then placed the cloth on top and fully covering the scanner bed plate , then a white card over the top of the material , hey presto when the scanned image came out . i now had a handy rule as measurement for the cammo pattern , also tried it on water bottle cover and ak 47 ammo bag, works treat . cheers ian