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 17:07:41 GMT
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Viewed:
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2778 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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That may be true, but antialiasing isn’t a filter in that sense. When applied
to computer-generated graphics, it’s calculated during rendering using
information that isn’t available in the final image. When aplied during image
scaling (shrinking), it makes use of the image information in the original
(higher-resolution) image. The antialiasing you see in digital camera images is
a combination of a physical antialiasing filter placed in front of the camera
sensor (often integrated into the camera’s IR filter, apparently) and smoothing
algorithms. So even if you knew which form of antialiasing was used on a
particular image, I don’t think you could create a filter to undo it.
--Travis
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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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