Subject:
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Re: img2sticker: Convert images into .ldr stickers
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 30 Jun 2005 09:35:26 GMT
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Viewed:
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2562 times
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In lugnet.cad, Travis Cobbs wrote:
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In lugnet.cad, Timothy Gould wrote:
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Its just a pity that with 24bit colour everywhere, aliasing is used on
everything (and of course it is hard to reverse). I remember in the good old
days of 256 colour images where aliasing was only for the very, very best
pictures.
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Just as a note, it’s actually antialiasing, not aliasing. Aliasing (aka
jaggies) is the problem that antialiasing solves. And you’re right; it’s
very difficult to undo normally. On the other hand, for images that stickers
are likely to be made for, down-sampling to very few colors will mostly get
rid of the problem, and the pixels can be cleaned up by hand after that.
--Travis
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I did know that ;-) (and checked through all documents to make sure I had it
right). I blame it on posting too long after I’d turned into a pumpkin.
The thing is, anti-aliasing should be invertible if you know the routine used to
perform it in the first place. Of course it could be very slow as you have to
invert a #pixels x #pixels matrix (althought it would be sparse). Maybe someone
could write a GIMP or Photoshop plugin for it.
Tim
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Message has 1 Reply:
 | | Re: img2sticker: Convert images into .ldr stickers
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| (...) Hmm, I don't think so. Traditional antialiasing spreads the partial pixel errors from a line (or edge) into the adjacent pixels. In order to undo it you'd need to know where the line is, but that's the very information you're trying to recover (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
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Message is in Reply To:
| | Re: img2sticker: Convert images into .ldr stickers
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| (...) Just as a note, it's actually antialiasing, not aliasing. Aliasing (aka jaggies) is the problem that antialiasing solves. And you're right; it's very difficult to undo normally. On the other hand, for images that stickers are likely to be made (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
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