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Assuming image resolution: | |
72ppi = 5184 pixels per square inch | |
Surface area of the Earth: | |
510,072,000 km2 = (7.90613181 × 10 to the 17th) square inches | |
Assuming (for a lossless PNG) an average storage size of: | |
~7.76 bits per pixel | |
7.90613181 × 10 to the 17th square inches | |
* 5184 pixels per square inch | |
_______________________________ | |
4.09853873 × 10 to the 21st pixels | |
4.09853873 × 10 to the 21st pixels | |
* ~7.76 bits | |
_______________________________ | |
3.36744942 zettabytes | |
((7.90613181 × 10 to the 17th) * 5184) * 7.76 bits | |
3.36744942 zettabytes | |
or | |
3.70254979 × 10 to the 12th gigabytes | |
or | |
3,702,549,790,000 gigabytes | |
Note: | |
I realize that ppi is somewhat contentious. I only chose | |
the 72ppi figure because it was convenient-ish. According | |
to Wikipedia, photographs should be printed at 300 ppi to | |
look decent. | |
http://en.wikipedia.org/wiki/Pixel_density | |
In that case, a 300ppi image will weigh in at: | |
58.5 zettabytes |