[lug] deconstructing pdf of voted Boulder ballots

[Kenneth D. Weinert]

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On 12/09/2011 12:17 AM, Neal McBurnett wrote:

> Can any of you pdf gurus help out?

I don't know if I'd classify myself as a guru, but all of those
CCITFaxDecode objects are images.

 3824 0 obj<<
    /BitsPerComponent 1
    /DecodeParms<<
      /Columns 1481
      /K -1
    >>
    /Filter/CCITTFaxDecode
    /Height 150
    /ImageMask true
    /Length 413
    /Subtype/Image
    /Type/XObject
    /Width 1481
>> stream

There's an example of an image object. It's object #3824, generation
0. The << indicates the start of a dictionary.
BitsPerComponent of 1 says it's a black and white image.
Columns is self-explanatory and I don't recall what K is off the top
of my head, although it might be an indicator of whether or not the
image is reversed (white/black or black/white.)

/Filter gives /CCITTFaxDecode, a very common encoding for B&W images.
The /Subtype and /Type describe the type of object it is.

Then the object dictionary ends (the last >>) and the data attached to
the object begins (the stream) and there will be an endstream at the
end of the data (which is 413 bytes long.)

Does this help at all?

Ken
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