{
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      "content": [
        "What packing a document saves"
      ],
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    },
    {
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      "content": [
        "A PDF is mostly dictionaries — the catalogue, the page tree, every page, every font, every annotation — and a dictionary is not a stream, so each one is written out in full and none of them is compressed.\nObject streams gather them into streams that are compressed together, and the table stating where every object lives becomes a stream too. The document a reader sees is the same one either way."
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      "type": "text",
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      },
      "content": [
        "The document weighed here holds 24 pages of text, each with a heading of its own."
      ],
      "font": "DejaVuSans",
      "font_size": 10,
      "leading": 14,
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      "rect": {
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        "The same document, weighed twice"
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      "pages": [
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    },
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      "type": "text",
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      "content": [
        "Spelled out"
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      "pages": [
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    },
    {
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      "content": [
        "22 724 bytes"
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      "pages": [
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    },
    {
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      "content": [
        "18 370 bytes"
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      "type": "text",
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      },
      "content": [
        "Saved"
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      "pages": [
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    },
    {
      "type": "text",
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      },
      "content": [
        "4 354 bytes"
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      "pages": [
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      "type": "text",
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      "content": [
        "Packing this document saved 19 per cent of it. What it saves goes up with the number of pages, because a page costs a handful of dictionaries and dictionaries are what packing compresses."
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    },
    {
      "type": "text",
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        "ury": 424
      },
      "content": [
        "This very file is packed, so a reader that opened it has read one of the two documents being weighed."
      ],
      "font": "DejaVuSans",
      "font_size": 10,
      "leading": 14,
      "pages": [
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    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 740.0,
        "urx": 535.0,
        "ury": 758.4
      },
      "content": "The same document, weighed other ways",
      "font": "DejaVuSans",
      "font_size": 18.0,
      "first_baseline": {
        "points": 0
      },
      "pages": [
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      ]
    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 716.0,
        "urx": 535.0,
        "ury": 748.0
      },
      "content": "With compression off it weighs 31 089 bytes; at level 1, 26 750; at level 6, the default, 22 724; at level 9, 22 713.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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      ]
    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 678.0,
        "urx": 535.0,
        "ury": 710.0
      },
      "content": "Given a title, it weighs 22 818 bytes with its information dictionary and 25 265 without it, the title then said in its metadata alone; the dictionary is written: no.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 640.0,
        "urx": 535.0,
        "ury": 672.0
      },
      "content": "A dry run, which writes nothing, counts 24 pages and 55 objects, written as PDF 1.7 though PDF 1.4 would do, and 0 warnings.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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      ]
    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 602.0,
        "urx": 535.0,
        "ury": 634.0
      },
      "content": "Written with its warnings reported it weighs 22 724 bytes, and 22 724 written to a stream the same way; warnings: 0.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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      ]
    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 578.0,
        "urx": 535.0,
        "ury": 596.0
      },
      "content": "Packed into object streams: no; laid out first page first: no; the version it needs: PDF 1.4.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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      ]
    },
    {
      "type": "flow",
      "rect": {
        "llx": 60.0,
        "lly": 540.0,
        "urx": 535.0,
        "ury": 572.0
      },
      "content": "With a cover put in front and a bookmark to it put first, it holds 25 pages, and its first bookmark reads “Cover”.",
      "font": "DejaVuSans",
      "font_size": 10.0,
      "leading": 14.0,
      "pages": [
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    },
    {
      "type": "flow",
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        "llx": 60.0,
        "lly": 488.0,
        "urx": 535.0,
        "ury": 534.0
      },
      "content": "A line of four hundred characters measured inside a measuring pass costs the file nothing: 7 449 bytes, and 7 449 with the pass held open by hand, against 24 826 when measured outside one.",
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