[rescue] Risks of lossy algorithms - was Re: Scanning Best Practices - was Re: Inside Solaris newsletter
toby at telegraphics.com.au
Sun Oct 5 21:25:29 CDT 2014
On 05/10/14 9:59 PM, Jonathan Patschke wrote:
> On Thu, 2 Oct 2014, Toby Thain wrote:
>> 3) Be very careful with DJVU compression - it is lossy! - the results
>> can be surprisingly dangerous. I can't find the link now, but there
>> are published examples of schematics involving substituted numbers
>> (literally one digit for another). It's clearly a risk derived from
>> the way djvu works. Use lossless TIFF LZW or similar.
> My understanding is that those instances are from defects in Xerox
> firmware, not from the design of djvu.
Perhaps - but I am not sure it's possible to rule this out in any djvu
implementation. Do you happen to be able to find the original citation?
I couldn't find it in a few minutes' googling.
> Still, as a general, rule, do not
> use lossy compression for archival. Data are precious; do not discard
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