2 hours 52 minutes
welcome back to printing Security Intermediate course, and in this video I'm going to talk about devolution of printing languages. So in this video you will learn
the reasons why we have page description, languages of printing languages and what they actually are. And how did they involve Evolve?
the reason we have big description languages
is we need to standardize the process of printing.
Before they existed, every printer had to have
the driver, which was communicating directly with the harbor off the printer.
So you had the instructions for that particular printer that we're allowing the document from the PC to be translated into printed
print on the paper.
this is a problem because that means that as number of models on the market evolved, you needed to have a distinctive from the ground up ground up written driver for that particular device
within introduction off printing a page description, languages of printing languages. You could basically have ah, part of code that corresponds to that printing language, and then just add some things in a driver that are specific for that device. For example,
if the printer is black and wide to you, send only black
to the printer. If it's cholera you're sending the color
information is well,
and these things were not plans. They evolved have not been planned. They simply did. These languages, they simply evolved. Aziz, printing techology and needs for the upgrades evolved. So let's talk about devolution,
which will give you some idea why these things looked like they look today.
So in 1978 we had one of the first
essentially printers in the world commercial printers, which was absent MX 80. It was a duck Mataric sprinter with nine pin print head, which could print
a character composed off nine dots placed on the paper. Why at the
rubber bands that is similar to one that was used in the typewriters before,
Um, and the printing language for that device was called SC slash B, meaning that if you send to the device the plain asking character, it would be printed unless
you have the escape character, which is asking code 27 Cent and then everything after that character or not everything but the next couple of characters meant that it is actually a command cold. For example,
you print a couple of letters they want to go to the next line. You said Escape
sequence that tells the printer toe. Move the paper up for one row and move the carriage back to the position. One on the paper
we had HP thing jet, which was the first injured commercial injured printer on the market. And he had HPV is PCL one language,
which was slightly different because the finger technology was much more suitable for printing there just text, but also some kind of graphics and the PCL language. L basically gave the introduction the possibility of these things to be done.
Uh, later day the same year we had the laser jet, uh, HP laser jet, also from HB. And he had PCL three, which had very, very advanced the way off putting graphics toe a paper which is not just plain text
off course in that those times any graphics that was sent to a printer was basically arrest arised in a driver and what printer was receiving with just the stream off dots, ones and zeros. And then it was simply placing these ones and zeros on the paper
on and having them
printed with the laser of Mechanism.
one year later, Apple introduced Laser Writer and it's the first printer ever that had integrated postscript in. And this is very important development because this allowed for high quality graphics. And, let's say, uh,
print quality texted when I said print quality text, I mean
the one that was being
printed the in standard offset printing shops on your desktop.
Eso it had the very, very high it could use Postscript fonts, which were the invention off Adobe Company. The postscript was basically their first product,
and the whole thing was oriented more not just the office environment, but more to the people who were involved in pre press in graphics preparation in or creation of graphical content.
In 1990 we had a laser three. And this is the first printer that introduced PCL five, which has become defective standard in printing world after
and very soon after introduction of PCL five HB made this language public domain. So the whole specification off PCL five has been published and every everybody can access it and use it in their printers.
Uh, then five years later, HP has introduced laser jet for 1000 this one had PCL six, which had some improvements over PCL five. But unlike B. C. 05
didn't have it wasn't the public domain. So um,
it was ah, proprietary and state proprietary. Print the page definition language off HB, although many people have Ah, let's say reversed, engineered and pretty much every vendor offers Basile six
a capability on on their laser printers and high end daily inject printers.
But essentially, this is this is much less used today. HP has evolved PCL Stick Official six to PCL Excel,
which brings some kind of backward compatibility to PCL five because PCL six was, ah Quantum leap from PCL five. And it's not that record compatible. Unlike PC or five, whose
compatible with all the previous version of PCL 123 I don't think for ever existed or for very short video period of time, but it was a pendant.
we see the difference between PCL five and PC or 16 year old after going to talk about this a little bit later is that PCL five is, uh, has basically print file is a text file, so everything is sent, but there's a text
while PCL six is has is a binary
file. So the weights the data is saved is different.
And at the end of this
lesson, let's do a quick alert Jack. So on which printer was postscript first introduced? Is it HP Laser jet? Is it HB thing? Just 20 to 25? Or is it April Apple laser writer?
And the correct answer is, if you remember correctly, Apple lays a writer
in this lesson. You have learned about the reasons why we have page the finishing languages of PD Els,
and we also talked about the evolution off PD Els. How they started, where they are now. And what are the usual
PPL's that we're using today?
In next lesson, I'm going to talk in detail about Petey L's that we use today.
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