Ludolf that is *INCORRECT*.  PDF and Postscript only share a very common 
heritage and some similar core data structures (such as dictionaries and 
arrays) – but beyond that, they are VERY VERY DIFFERENT including the fact that 
PDF is *NOT* a programming language.   It is unfortunate, that even after 30 
years(!), this misconception remains out there.  It is why it is one of the 
first slides in my “Everything you wanted to know about PDF” presentation.

Leonard Rosenthol
Senior Principal Architect for PDF, Adobe

From: Tiff <[email protected]> on behalf of Ludolf Holzheid via Tiff 
<[email protected]>
Date: Saturday, July 13, 2024 at 8:16 AM
To: [email protected] <[email protected]>
Subject: Re: [Tiff] DATALOSS - tiff2pdf option -n does not, what I expect ...
EXTERNAL: Use caution when clicking on links or opening attachments.


On 2024-07-13 11:56 +0200, Ulf Zibis via Tiff wrote:
> [..]
>
> Btw: I do not see that PDF is a vector image in general. In my understanding 
> PDF is a container format, holding any kind of formats and encodings.
>

Hi Ulf,

PDF is no container format, but a binary representation of (a subset
of) PostScript.  PostScript is a page description language, primarily
handling vector graphics at different levels of abstraction.  As a
(Turing complete) programming language, it is also capable of handling
binary data such as raster images.

In fact, raster graphics in PostScript and PDF are ‘printed’ by
plotting a vector graphic rectangle for each pixel.

PDF/PostScript interpreters such as GhostScript are sometimes referred
to as ‘raster image processor’ as they plot vector graphic elements as
described in the PDF or PostScript file to the ‘canvas’ of a raster
image.

Ludolf

--

Ludolf Holzheid    [ˈluː.dɔlf ˈhɔlt͡s.haɪ̯d]
Heinrichstraße 6   [ˈhaɪ̯n.ʁɪçˌʃtʁaː.sə 6]
68642 Bürstadt     [68642 ˈbyːɐ̯.ʃtat]
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