Any 2400 dpi printer?

  • Thread starter Thread starter Talal Itani
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Talal Itani

Hello,

I am searching for a printer that print at 2400 dpi, or more. Many printers
on the market claim to print at 2400 dpi, but they only use interpolation to
get the high resolution. Please help.

Talal
 
Talal Itani said:
Hello,

I am searching for a printer that print at 2400 dpi, or more. Many printers
on the market claim to print at 2400 dpi, but they only use interpolation to
get the high resolution. Please help.
Click to expand...
What do you need that for, I'm not sure you will get a real print
resolution above 600 dpi. I think my Xerox Phaser claims 1000 dpi but I
think that is interpolated. My Canon CLC does a true 400 dpi per colour
and newer ones I think reach 600 dpi but these are upwards of $10,000
 
Talal Itani said:
Hello,

I am searching for a printer that print at 2400 dpi, or more. Many printers
on the market claim to print at 2400 dpi, but they only use interpolation to
get the high resolution. Please help.
Click to expand...

You may look at imagesetter (phototypesetter) or more recent devices such as
CTP devices. Imagesetters produce film at 2540 or higher resolution.

Norbert
 
You may look at imagesetter (phototypesetter) or more recent devices such as
CTP devices. Imagesetters produce film at 2540 or higher resolution.
Click to expand...
^^^^

2540/inch = 1000/cm = 100/mm
So they are already metric. To give this value as "2540/inch"
is as pointless as to write "328 ft" instead of "100 m" in sports.
 
Talal Itani said:
Hello,

I am searching for a printer that print at 2400 dpi, or more. Many
printers on the market claim to print at 2400 dpi, but they only use
interpolation to get the high resolution. Please help.

Talal
Click to expand...
Frankly, I don't believe that you could tell the difference between 1440 dpi
(on my epson photo 1280) and 2400 dpi (on whatever). Those dots are quite
small.
I assume that you are talking about dots per inch not pixels per inch.
There isn't much reason to print at more than 300 pixels per inch. Some
people confuse dots per inch with pixels per inch; they are helped in their
confusion by the statements of the printer makers.
Jim
 
[email protected] said:
What do you need that for, I'm not sure you will get a real print
resolution above 600 dpi.
Click to expand...

There's a simple test: Print some text at 2 pt. size. A 600 DPI printer will
print it barely readable but a 1200 DPI printer will produce readable
characters. I did some test on some Oki color laser printer that claim to
print at 1200 DPI - and they do. You may as well look at
http://www.druckerchannel.de/artikel.php?ID=34
or at http://www.druckerchannel.de and goto download.

Norbert
 
SOME PEOPLE COUNT SHEEP AND SOME COUNT DOTS
Frankly, I don't believe that you could tell the difference between 1440 dpi
(on my epson photo 1280) and 2400 dpi (on whatever). Those dots are quite
small.
I assume that you are talking about dots per inch not pixels per inch.
There isn't much reason to print at more than 300 pixels per inch. Some
people confuse dots per inch with pixels per inch; they are helped in their
confusion by the statements of the printer makers.
Jim
Click to expand...
 
Hello,

I am searching for a printer that print at 2400 dpi, or more. Many
printers on the market claim to print at 2400 dpi, but they only use
interpolation to get the high resolution. Please help.

Talal
Click to expand...

Hello Talal,

Please tell us *why* you want to print 2400 dpi. What are you printing,
and on what kind of paper?
 
What type of printer are you referring to, monochrome, color, laser,
inkjet???

Art
 
A bit of explaining is in order about these numbers.

Firstly, no inkjet printer can print at these resolutions, because
simply put, the dots are too large to fit than many in the area being
discussed. So, when a printer speaks about 1440 or 2880 or even 5760
dpi, it is speaking about addressable locations, not actual dots.

Secondly, the only way these printers accomplish this is by overprinting
or several passes. The stepper motors are not that accurate, and the
time it would take would be enough to make people give up.

Thirdly, as Jim states, these are ink dot addresses per inch not pixels.
To create a color, as a mixture of 4, 5, 6, 7, 8, 9, or even 10 colors
of inks often requires a 3 x 3 matrix or larger number of dots which
cumulatively appear like a color.

If speaking about laser or black and white, this is somewhat of a
different store, however. SInce laser printers cannot overprint multiple
passes, and black and white dot resolution does determine gray scale levels.

Art
 
Arthur Entlich said:
If speaking about laser or black and white, this is somewhat of a
different store, however. SInce laser printers cannot overprint multiple
passes, and black and white dot resolution does determine gray scale levels.
Click to expand...

No, it doesn't.

Only one one bit engines is that the case.
 
Although your message appears to have gotten scrambled, even if I try to
translate it, it still doesn't seem to make sense relative to what I am
speaking of.

The number of greyscale levels perceivable on a black and white laser
printer image are DIRECTLY related to the resolution of the printer.
Laser printers use screens or error diffusion of other dot patterns to
create a greyscale level in a "cell". Since a laser printer, in theory,
can only produce one binary condition per dot position (either on
(black) or off (white)), the perceived greyscale is directly determined
by the number of combinations or percentage of on or off dots within an
area that can be produced. Since humans are the viewers, viewing
distance and visual acuity determine at what point we blur an area into
a continuous tone, whether it is or not in fact. Very few printing
techniques are true continuous tone. Photographic images and dye sub are
probably the closest.

Inkjet, laser, etc are not, as they can only lay down one density of
color per dot based upon their inks or toners. Some can make larger or
smaller dots, but very few other than dye sub actually have varying
density of ink per location.

Getting back to B&W lasers, if a cell were 2 dots by two dots, as an
example, the options would be:

4 black
3 black one white
2 black 2 white
1 black 3 white
4 white

or five steps from pure black to white.

If the cell were made up of smaller dots and it was 3 dots by 3 dots,
that same area could represent several more levels from black to white.

If that same area were able to have 16 dot in each direction, or a total
of 256 dots which could either be black or white, the number of
perceived greyscale patterns would increase still further.

Therefore, in black and white laser printing, the resolution directly
determines the perceived number of greyscale levels the printer can
represent.

Art
 
Arthur Entlich said:
The number of greyscale levels perceivable on a black and white laser
printer image are DIRECTLY related to the resolution of the printer.
Click to expand...

Only if the printer is a one-bit engine.

There *are* 4 and 8 bit laser engines out there.
 
Talal,

the resolution can be tested by vector graphic test
patterns:

http://www.fho-emden.de/~hoffmann/raster16052003.pdf

Manufacturer's Lpi and dpi are rather meaningless.
Actual rasterizers are really sophisticated
(one manufacturer promisses 9600 dpi in one direction).
Just two numbers don't characterize the final quality.

Simply let them print the test patterns.
What can we expect ? Not more than 1.5 to 2.0 black
lines per raster cell, if ithe printer uses cells
(offset AM, ordered dithering, opposed to error diffusion).

For an integrated test (including color) one can use
these test pages:

http://www.fho-emden.de/~hoffmann/a3gencolortest.pdf
(Web preview version, print version link in the doc).

Best regards --Gernot Hoffmann
 
Although I was adducing black and white laser printers, when you state
you have an 8 bit CMYK printer, do you mean the printer is capable of
creating different densities of toner dot, and if so do you know how
that is done?

Art
 
Arthur Entlich said:
Although I was adducing black and white laser printers, when you state you
have an 8 bit CMYK printer, do you mean the printer is capable of creating
different densities of toner dot, and if so do you know how that is done?
Click to expand...

Color laser uses a halftoning process, and does not deposit variable density
dots. AFAIK, dye-sub is the only process that actually does this.
 
That's what I assumed, which was my whole point about resolution
determining number of gradients in a black and white laser printer. The
same seems true of color ones.

Art
 
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