Most of us will have never heard of the term ‘DPI’ or know that it stands for ‘Dots-Per-Inch’. DPI refers to the physical dot density of an image when it is for example printed onto paper, or displayed on a computer monitor. So in simple speak the more dots per inch, the higher the resolution of the image the richer the resulting digital image will be.
A high DPI setting mimics the original image in a truer fashion than lower DPI settings are capable of doing. If the image is to be enlarged, a high DPI setting is necessary. Otherwise the enlarged picture will look "blocky" or blurry because the software lacks information to fill in the extra space when the image is enlarged. Instead it "blows up" each pixel to "smear" it over a wider area. Technically again, the more correct term in this application is sampled PPI, but DPI is more often used.
Scanning is the process of converting paper to digital and in this process DPI is used to adjust the amount of detail of the scan. The DPI setting of the scanner relates to the final pixel size of the scanned image. If you put a 5" x 7" photo on the scanner and scan it at 300 dpi, the resulting digital image will be 1500 x 2100 pixels in size (5" x 300 = 1500 and 7" x 300 = 2100). In this case, DPI does relate to quality, since the higher the scanner DPI setting the more information is being collected. Best results for paper photos are generally achieved within a range of 300 dpi (sufficient for most photos) to 600 dpi (if you want to enlarge the image).
We believe that people should only need to have their old photographs digitally scanned once. Photos Reunited scans all images at minimum 600 dpi as standard, unlike most other companies who like to charge a hefty premium for this quality option. By scanning at 600 dpi we offer the customer the best quality image for all future printing requirments, either that be a new photo album, printed photo book or a large portrait of a former family member or ancestor.
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