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 15:34:30 GMT
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Viewed:
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2545 times
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In lugnet.cad, Timothy Gould wrote:
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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 from the image.
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Strictly speaking though, (almost) any filter is invertible. Of course
you do need to know what the original filter was which is easier said
than done.
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Yeah, but if you think of line antialiasing as a sort of blur filter,
you’ll notice the convolution kernel is directional. The blurring occurs
perpendicular to the direction of the line. This implies a different
filter for each line segment on an edge. Knowing the direction of ALL
the filters is the same as knowing where the lines are.
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Message is in Reply To:
 | | Re: img2sticker: Convert images into .ldr stickers
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| (...) Strictly speaking though, (almost) any filter is invertible. Of course you do need to know what the original filter was which is easier said than done. (...) Although it even worse as the image has been stored a a jpeg which bleeds the colours (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
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