Sagebrushfire, it really makes sense when described that way. You also answered another question I always had...I have wondered why several photos taken on the same camera, with the exact same settings have always had different file sizes. It's all clear to me now. Thanks!
Canon EF-S 18-55mm f/3.5-5.6 IS
Canon EF-S 55-250mm f/4-5.6 IS