Ordering fabric by gray-scale

The final fabric preparation step was to order the fabric from light to dark by using a gray-scale conversion. To do this, I set each folded cut outside on a sunny day. I tried to order the fabric from light to dark. Then, I took a photo. I converted the photo to gray-scale and made adjustments until the fabric was more or less in order. Below are two of the photos from this process when I was getting close to having the fabric in order.

Getting the fabric in order by tone is important for block lay-out. In general, I will go by dark, medium and light tones. I keep track of which fabric is which by stapling a number in the selvage and I recorded the tone (dark/medium/light) for each number in my notebook.