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Understanding aspect ratios can be intimidating, but it’s really quite easy if you can remember how to factor fractions.  Factor your width and height to the lowest common denominator and you will have your aspect ratio.

For example, if you have a painting that is 18″x24″, then you factor 18/24 to its lowest common denominator to understand the ratio. Dividing 18/24 by 6, you get 3/4, or a 3:4 aspect ratio. If you have a 20″x30″ painting, or 20/30 = 10, which equals 2/3, this gives you have a 2:3 aspect ratio.

Now for example, if you want to make an 8″x10″ print from a 20″x30″ painting,  you will realize quickly that you can’t do it. You can have an 8″x12″, but not an 8″x10″. There are many other examples, but this should suffice in understanding the concept. The calculator will do the rest for you. 

Optical brightening agents (OBAs) are chemical compounds used in fine art prints, particularly in papers, to enhance the brightness and whiteness of the substrate. These agents fluoresce under ultraviolet (UV) light, emitting a blue light that counteracts the natural yellowish or dull appearance of paper. The result is an optical illusion of increased brightness and a perception of whiter, cleaner whites in the printed image.

OBAs are often added to the paper during the manufacturing process. While they can initially enhance the visual appeal of prints, it's important to note that the fluorescence of OBAs can degrade over time due to exposure to light and environmental factors. Consequently, the long-term color stability of prints with optical brightening agents may be a consideration in archival or museum-quality applications. Artists and photographers may choose OBA-free papers for works intended for long-term display or preservation.