Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

I've pondered this argument a long time because something in it didn't sit right with me. I agree with you, but then sauoq is correct as well.

The problem is we're talking about two different levels here.

One is the representation of an image. Even capturing it on any kind of media is already a lossy step, because nothing short of an exact replica of of the entire scenery (that is, in meatspace, with the exact same materials and everything used) can ever record that image absolutely faithfully. Here indeed PNG is lossy as well - by definition, in fact, since there is no such thing as a lossless image capture media.

The other is the representation of a finite stream of bits. On this level it is certainly very possible to achieve an entirely faithful capture of the input. I don't think we need to argue this any further.

I agree with you insofar as people do tend to confuse these issues. However, you failed to point out the distinction as well. I knew both positions in the argument where right even though they seemed to conflict - and even though I'd consider myself at least somewhat knowledgable of information theory, and it is so very obvious in hindsight, it is obviously easy to confuse these.

Also note that repeated reserialization of an image into a bit stream as performed by JPEG will reduce the accuracy of the reconstructed input. JPEG being "lossy" in both sense thus is a downside if you're going to manipulate the image further. It is a mighty fine final storage format, of course.

Makeshifts last the longest.


In reply to Re^2: GIF patent by Aristotle
in thread GIF patent by didier

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others contemplating the Monastery: (2)
    As of 2019-12-07 03:51 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      Strict and warnings: which comes first?



      Results (160 votes). Check out past polls.

      Notices?