Chronic myeloid leukemia (CML) is a rare type of blood cancer and occurs when the bone marrow makes too many of one type of white blood cell, called myeloid cells. Almost all CML cases are caused by an abnormal chromosome called the Philadelphia chromosome.
These are new 18X24 Quality Picture Mats. The Openings are Bevel cut 12.5 x 18.5 to fit a 13X19 photo or print. These mats are cut from Quality white core mat board and are excellent for framing photos or prints.
Numbers aside, 12x18 inch prints from the 6 mega-pixel DSLR simply make a better impression on those who view them, including me. With this as a standard it's an easy mathematical exercise to determine what resolution is required to get the same print quality in larger sizes.