Tech Support Memes

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Memes about IT and computer related things, funny screenshots, or things you see out in the wild.

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TheWaterGod@lemmy.ca

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You could make a 1:1 map on some countries (sh.itjust.works)

submitted 1 week ago* (last edited 1 week ago) by diemartin@sh.itjust.works to c/techsupportmemes@lemmy.ca

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[–] noughtnaut@lemmy.world 5 points 1 week ago* (last edited 1 week ago) (1 children)

I wanted to say "[citation needed]", this seems to be straight from Wikipedia (which it is, it's the last paragraph of the "File format" section).

Unfortunately there's no clear basis for this information, except a reference to the (entire) "PDF Reference".

The article image is essentially identical, but it's not the same and must have been remade at some point. I wonder if the wiki editor lives at the centre of the square?

[–] noughtnaut@lemmy.world 5 points 1 week ago* (last edited 1 week ago)

From the reference document:

"Implementation limits", p. 991ff:

PDF itself has one architectural limit: Because ten digits are allocated to byte off-sets, the size of a file is limited to 1010 bytes (approximately 10 gigabytes).

and

The minimum allowed page size is 3 by 3 units in default user space; the maximum is 14,400 by 14,400 units. [...] Beginning with PDF 1.6, the size of the unit may be set on a page-by-page basis; the default remains at 1/72 inch. (See implementation note 177 in Appendix H.)

That implementation note, by the way, roughly states that "the UserUnit entry of the page dictionary" is more or less a dimension multiplier, and that:

Acrobat 7.0 supports a maximum UserUnit value of 75,000, which gives a maximum page dimension of 15,000,000 inches (14,400 * 75,000 * 1 ⁄ 72).

and

The magnification factor of a view is constrained to be between approximately 8 percent and 6400 percent. These limits are not fixed; they vary with the size of the page being displayed, as well as with the size of the pages previously viewed within the file.

All in all, dealing with a page of such humongous dimensions sounds rather bothersome.