I am working in Adobe Photoshop right now and I am trying to measure a photograph that I have situated inside a greeting card that I plan on selling on Etsy. The greeting cards are white and the photo sits directly in the center of the front flap. Etsy is asking me for an exact description of the card and wants to know the measurement of the photo. I am using the Ruler Tool in Photoshop to measure, but the result is coming out as pixels. I would like to see inches. Is there a way to change this setting?