Digital Print Enlargements Know-How
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With all of the advances in digital technology, digital photo can now be viewed almost anywhere through any medium. Most of the time however, you are going to want to print out your photos, typically on standard paper sizes like 4X6 or 5X7. But what should you do if you have that special photo that you want to make an enlargement of? Print enlargement quality is based on your digital camera mega pixels figure. Let's look at how
There is a certain resolution referred to as number of pixels in each digital photo that you take. Pixels can be represented by one number or sometimes as two numbers depicting the number of pixels over the X axis and the number of the Y axis (multiply these two numbers together to determine the total number of pixels in the digital photo).
You are actually printing these digital pixels on paper when you print your digital photos. If the paper size is big and the resolution is large, the digital print quality will be poor. The end result can be the ability to actually see the individual pixels on the print. This is known as pixelization.
So how can you determine what is the maximum print enlargement that you can make from a certain digital photo? There is no one precise answer. In addition to the actual number of pixels in the photo there are other things that can influence the answer like how many details are in the photo, what were the lighting conditions and more. Even when considering the number of pixels the answer is not precise since different people would have different views about the quality of a photo print.
A rough assessment of what comprises a good print quality is based on the pixels density or in other words the number of pixels per inch on the printed photo. This is also known as PPI (pixels per inch) and it represents the number of pixels over an axis line.
The following qualities are usually linked with a specific PPI number:
PPI 100 - fair to bad
PPI 200 - good
PPI 300 and up - very good
The next rational step would be to determine how many mega pixels are needed for good quality printing on a particular paper size. Don't worry, calculating this number is very easy. All you need to do is to simply multiply the page length by its width in inches, resulting in the number of square inches on the page. Now multiply this number by the square of the PPI number and the result is the number of pixels on the page which is the number of pixels we want our source photo to have. Here are the numbers calculated for some common sizes (for 100,200 and 300 PPI respectively):
page 4X6 0.24MP 1MP 2MP
page 5X7 0.35MP 1.5MP 3MP
page 8X10 0.8MP 3MP 7MP
11X14 1.5MP 6MP 14MP
page 16X20 3MP 12MP 28MP
page 20X30 6MP 24MP 54MP
This table is just an estimation of what is considered suitable number of mega pixels for different paper sizes. There are many other factors to consider when making enlargements. Experimenting with different paper sizes is the best way to go but it can be expensive. In addition sometimes what is considered poor quality pixelization can actually be a nice artistic effect which strengthen the unfortunate fact that in addition to the above calculation some common sense and experience are needed in order to match a specific digital photo to a specific paper size enlargement.
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