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Is there a LaTeX command (and package) by which I can put out of focus the resulting
pdf output so that this won't be so terribly sharp when printed with a 1200x1200dpi printer?

I.e. how do I enclose entire content between begindocument ....TEXT enddocument
into a command directing to put out of focus the resulting pdf?

Imagine the wanted result something like I scan and print the relevant page a few times in a series to achieve this result, but rather by a systematic command
with adjustable numeric parameters.

Adding

pdfpkresolution100
pdfmapfile
usepackagecolor
pagecolor[gray].95

makes it use (very) low resolution bitmap fonts, disable using scalable fonts, and add a light grey background.

% This is a sample LaTeX input file. (Version of 12 August 2004.)
%
% A '%' character causes TeX to ignore all remaining text on the line,
% and is used for comments like this one.

documentclassarticle % Specifies the document class

pdfpkresolution100
pdfmapfile
usepackagecolor
pagecolor[gray].95

 % The preamble begins here.
titleAn Example Document % Declares the document's title.
authorLeslie Lamport % Declares the author's name.
dateJanuary 21, 1994 % Deleting this command produces today's date.

newcommandip[2](#1, #2)
 % Defines iparg1arg2 to mean
 % (arg1, arg2).

%newcommandip[2]langle #1 
 % This is an alternative definition of
 % ip that is commented out.

begindocument % End of preamble and beginning of text.

maketitle % Produces the title.

This is an example input file. Comparing it with
the output it generates can show you how to
produce a simple document of your own.

sectionOrdinary Text % Produces section heading. Lower-level
 % sections are begun with similar 
 % subsection and subsubsection commands.

The ends of words and sentences are marked 
 by spaces. It doesn't matter how many 
spaces you type; one is as good as 100. The
end of a line counts as a space.

One or more blank lines denote the end 
of a paragraph. 

Since any number of consecutive spaces are treated
like a single one, the formatting of the input
file makes no difference to
 LaTeX, % The LaTeX command generates the LaTeX logo.
but it makes a difference to you. When you use
LaTeX, making your input file as easy to read 
as possible will be a great help as you write 
your document and when you change it. This sample 
file shows how you can add comments to your own input 
file.

Because printing is different from typewriting,
there are a number of things that you have to do
differently when preparing an input file than if
you were just typing the document directly.
Quotation marks like
 ``this'' 
have to be handled specially, as do quotes within
quotes:
 ``,`this' % , separates the double and single quote.
 is what I just 
 wrote, not `that',''. 

Dashes come in three sizes: an 
 intra-word 
dash, a medium dash for number ranges like 
 1--2, 
and a punctuation 
 dash---like 
this.

A sentence-ending space should be larger than the
space between words within a sentence. You
sometimes have to type special commands in
conjunction with punctuation characters to get
this right, as in the following sentence.
 Gnats, gnus, etc. all % ` ' makes an inter-word space.
 begin with G@. % @ marks end-of-sentence punctuation.
You should check the spaces after periods when
reading your output to make sure you haven't
forgotten any special cases. Generating an
ellipsis
 ldots % ` ' is needed after `ldots' because TeX 
 % ignores spaces after command names like ldots 
 % made from + letters.
 %
 % Note how a `%' character causes TeX to ignore 
 % the end of the input line, so these blank lines 
 % do not start a new paragraph.
 %
with the right spacing around the periods requires
a special command.

LaTeX interprets some common characters as
commands, so you must type special commands to
generate them. These characters include the
following:
 $ & % # and .

In printing, text is usually emphasized with an
 emphitalic 
type style. 

beginem
 A long segment of text can also be emphasized 
 in this way. Text within such a segment can be 
 given emphadditional emphasis.
endem

It is sometimes necessary to prevent LaTeX from
breaking a line where it might otherwise do so.
This may be at a space, as between the ``Mr.'' and
``Jones'' in
 ``Mr.~Jones'', % ~ produces an unbreakable interword space.
or within a word---especially when the word is a
symbol like
 mboxemphitemnum 
that makes little sense when hyphenated across
lines.

FootnotesfootnoteThis is an example of a footnote.
pose no problem.

LaTeX is good at typesetting mathematical formulas
like
 ( x-3y + z = 7 ) 
or
 ( a_1 > x^2n + y^2n > x' )
or 
 ( ipAB = sum_i a_i b_i ).
The spaces you type in a formula are 
ignored. Remember that a letter like
 $x$ % $ ... $ and ( ... ) are equivalent
is a formula when it denotes a mathematical
symbol, and it should be typed as one.

sectionDisplayed Text

Text is displayed by indenting it from the left
margin. Quotations are commonly displayed. There
are short quotations
beginquote
 This is a short quotation. It consists of a 
 single paragraph of text. See how it is formatted.
endquote
and longer ones.
beginquotation
 This is a longer quotation. It consists of two
 paragraphs of text, neither of which are
 particularly interesting.

 This is the second paragraph of the quotation. It
 is just as dull as the first paragraph.
endquotation
Another frequently-displayed structure is a list.
The following is an example of an emphitemized
list.
beginitemize
 item This is the first item of an itemized list.
 Each item in the list is marked with a ``tick''.
 You don't have to worry about what kind of tick
 mark is used.

 item This is the second item of the list. It
 contains another list nested inside it. The inner
 list is an emphenumerated list.
 beginenumerate
 item This is the first item of an enumerated 
 list that is nested within the itemized list.

 item This is the second item of the inner list. 
 LaTeX allows you to nest lists deeper than 
 you really should.
 endenumerate
 This is the rest of the second item of the outer
 list. It is no more interesting than any other
 part of the item.
 item This is the third item of the list.
enditemize
You can even display poetry.
beginverse
 There is an environment 
 for verse \ % The \ command separates lines
 Whose features some poets % within a stanza.
 will curse. 

 % One or more blank lines separate stanzas.

 For instead of making\
 Them do emphall line breaking, \
 It allows them to put too many words on a line when they'd rather be 
 forced to be terse.
endverse

Mathematical formulas may also be displayed. A
displayed formula 
is 
one-line long; multiline
formulas require special formatting instructions.
 [ ipGammapsi' = x'' + y^2 + z_i^n]
Don't start a paragraph with a displayed equation,
nor make one a paragraph by itself.

enddocument % End of document.