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Old 06-26-2016, 02:36 AM   #16
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It looks like secret code. Anyhow it seems you have the wrong input PDF file so the missing characters make no sense. The missing characters after converting 'The hitchhiker's guide to the galaxy' to 1-bit PDF on Kindle will eventualy produce The Ultimate Question.
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Old 06-26-2016, 09:34 AM   #17
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It looks like secret code. Anyhow it seems you have the wrong input PDF file so the missing characters make no sense. The missing characters after converting 'The hitchhiker's guide to the galaxy' to 1-bit PDF on Kindle will eventualy produce The Ultimate Question.
And we all know the answer is '42'.

Yes, the artifacts are (seemingly) missing letters, not missing pixels nor random missing blocks or pixels -- but specifically blocks of pixels that specifically bound complete single letters, as if by design. No software bug I know of can align to letter boundaries like that without an intelligent creator. This is too exacting to be a random bug, IMHO. Either a hoax, or a joke by a programmer from amazon (or here), or a kindle computer virus. Nothing else makes sense unless I am overlooking something here.

If it was a text document rather than just images containing text, then I could see other potential causes. But this specific condition remains a mystery to me.
Last edited by geekmaster; 06-26-2016 at 09:40 AM.
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Old 06-26-2016, 10:50 AM   #18
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Originally Posted by geekmaster View Post
And we all know the answer is '42'.

Yes, the artifacts are (seemingly) missing letters, not missing pixels nor random missing blocks or pixels -- but specifically blocks of pixels that specifically bound complete single letters, as if by design. No software bug I know of can align to letter boundaries like that without an intelligent creator. This is too exacting to be a random bug, IMHO. Either a hoax, or a joke by a programmer from amazon (or here), or a kindle computer virus. Nothing else makes sense unless I am overlooking something here.

If it was a text document rather than just images containing text, then I could see other potential causes. But this specific condition remains a mystery to me.
My money would be on one of the first two. Especially considering we do not know how the PDF was rendered in the first place.
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Old 06-26-2016, 12:08 PM   #19
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My money would be on one of the first two. Especially considering we do not know how the PDF was rendered in the first place.
It is merely a one-bit-per-pixel graphic IMAGE of a page. What we see as characters are just 2D blobs of pixels. So there are technically NO letters at all, from a "bits and pixels" point of view. Random bugs are extremely unlikely to respect character boundaries as demonstrated in the examples. Hence, not just a random bug. This anomaly seems to be of intelligent design.
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Old 06-26-2016, 12:24 PM   #20
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Ah, but consider the document processors that 'fake' grayscale with a palette (NiLuJe for details - I forget) -
We know the Kindles will barf on those images.

Back in the days when this document was produced from font files -
certain glyphs could have fallen into specific palette slots -
slots that did not survive the translation to black/white (1-bit grayscale).
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Old 11-10-2017, 09:07 AM   #21
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I used to have the same problem with PDF files on my Kindle Paperwhite. What worked for me was to convert the PDF to PS and then back to PDF.

On linux:

$ pdftops MyScannedPDF.pdf
$ ps2pdf MyScannedPDF.ps

Now no more missing characters (at least on Kindle Paperwhite)!!

(as pointed out by member isachummel on this thread)
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