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lossless vs. uncompressed - what are you doing?

avisys

Placitas, US
482 posts

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"RE: lossless vs. uncompressed - what are you doing?"

avisys Basic Member
Mon 16-Sep-13 01:14 AM | edited Mon 16-Sep-13 01:16 AM by avisys

>Waaaay back when, in the dark ages of computing, when a 10 MB
>hard drive cost several hundred dollars, there were programs
>that turned an entire drive into zip files. Files, including
>executable files, were decompressed on the fly. The original
>zip program was a lossless compression algorithm, just like
>the modern Nikon lossless compression.

Oh, yes. In the mid-80s, I purchased a 20MB hard drive to attach to an IBM PC. It was the size of a bread box. (Don't ask me to explain how big a bread box is). It cost me $600.00 at Fry's in San Jose.

The last hard drive I bought was a 2 tera-byte drive, the size of a split pack of cards. Let's see . . . that's 10,000 times the capacity of my original drive. The equivalent cost would be $6 million. Not to mention cost per byte per cubic inch, so we're probably talking $360 million.

Nevertheless, regarding ZIP and lossless data compression, there have been minor tweaks to the ZIP (actually PKZIP) algorithm, but in terms of compression ratio vs. compute overhead, there have hardly been any really significant improvements over the years. I'd bet the Nikon compression scheme is virtually identical to PKZIP.

AviSys

This is a hot, active topic! lossless vs. uncompressed - what are you doing? [View all] , sevtcard Silver Member , Sun 15-Sep-13 06:32 PM
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