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How big are the digitized images (“digital slides”)?

April 26, 2017big digital digitized images slides

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How big are the digitized images (“digital slides”)?

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When scanned at 54,000 pixels per inch, a 15 mm x 15 mm area of a slide corresponds to a 2.8 GB file. A 20:1 JPEG2000 compression of this file results in a more manageable 140 MB file. Using a 40x objective lens (108,000 pixels per inch) the file size for the same area quadruples to 11.4 GB uncompressed, and 560 MB compressed. Smaller file sizes can be realized at higher compression ratios.