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Printer DPI and PPI Ratings, General
Dots per inch stands for the maximum number of tiny spots of ink that the printer can place in a straight line where the spots are theoretically small enough (i.e. ignoring spreading or smearing effects of ink on paper) that if placed in every other such dot position leaving white space between them, the spots can be individually distinguished.
Pixels per inch stands for the maximum number of unique positions in a straight line that the printer can place an ink spot under control from the outside world, namely from a computer connected to the printer.
Lines per inch stands for how close thin parallel lines can be printed and still be distinguished in the finished printout. The spaces between the lines count as "lines".
Pixels per inch and dots per inch originally referred to the same thing. The printer mechanism was under the direct control of the computer and was physically positioned and placed dots as directed by the computer. Back then, most printer mechanisms were limited to placing dots only in positions suggested by a grid of dots X per inch horizontally and Y per inch vertically, for example 100x100 dpi
Nowadays, many printers put dots "wherever they want" as opposed to in positions suggestive of a horizontal/vertical grid. Still there is a minimum dot size and a minimum dot spacing.
A picture file (image file) represents pixels in a uniform horizontal/vertical grid pattern. And the printer needs to make a finished picture of the size, say 5x7 inches, that the user chose regardless of the number of pixels in the picture file. To simplify the process of relating the pixel count in the picture file to the possibly non-uniformly spaced dots on the paper, the printer or its supporting software may generate a temporary intermediate picture file with a set number of pixels per inch. The printer may have, internally, several choices of ratio of pixels to dots and the published rating can be the largest ratio except that the published rating may not exceed the dpi rating. Therefore there might be three "per inch" values involved at a given time, the pixels of the original picture file, the pixels per inch that the printer works with, and the dots per inch of the printer mechanism.
Pixels per inch is usually not mentioned with printers. All printers come with their own software (including parts called drivers) to install on your computer. Usually the software does not let you exercise control over individual dots using your picture file. Rather the printer takes your picture file or data file and uses its own built in logic to lay down the dots and create the printed output. We are led to believe that a printer's ppi is usually a fraction such as a half or a third of its dpi rating.
When a temporary picture file is created, there are at least two levels of software in use. High level software (which may run in your computer) takes your picture file and creates the temporary file. Low level software runs in the printer, takes the temporary file and controls the dot size and dot placement on the paper.
Sometimes a printer is advertised using a phrase such as "300 dpi 1200 dpi quality". This means that the printer has some way of making dark edges on a light background appear smoother than the first number would otherwise suggest. A printer with 300 dpi 1200 dpi quality definitely cannot resolve alternating dark and light pixels less than 1/300'th inch each. But curved and diagonal lines and color boundaries should not have jagged edges suggesting individual dots rigidly positioned on a grid with a 1/300'th inch pitch.
Hi. Try turning off the image sharpening in the print settings. For Windows, open the file and go to File > Print > Preferences/Properties in the Print window> Image Enhancement tab in the Lexmark 4500 Series Printing Preferences > choose None for Image Sharpening. Hit ok. Click Apply to save settings. Hit print to start printing. For Macintosh, open the file > go to File > Print > Print Settings > Advanced Settings > Image Sharpening > adjust setting to None. Try to print. Hope this helps. Good luck!
There are several causes of those.
So go to Xerox.com
Click "support and drives"
then in the product name box, Type DC12
Then any line click support
IN the search box type "spots" and read the relevant solution.
Web site designers create Web pages for display on a monitor, not for
users to print on 8.5- x 11-inch pieces of paper. This becomes obvious
the first time you try to print a Web page. Content you need may get
chopped off by the right printer margin, whereas content you don’t
need, such as the site’s copyright information, will print on its own
sheet of paper. Fortunately, you can avoid such problems with a little
Before printing any Web page, open Internet
Explorer’s File menu and select Print Preview. The current Web page
will appear on-screen exactly as it will print on paper. Scan the
preview carefully. If it appears that some content is chopped off by
the right margin, click the Page Setup button located directly to the
right of the Print button in the upper-left corner of the Print Preview
window. In the resulting Page Setup dialog box, adjust the left and
right margins so that each is set to 0.25 inches. The extra inch of
space you gain by resetting the margins should provide just enough room
to accommodate all of the content on most sites. Click OK to save the
changes and return to the Print Preview window.
Next, scan the
preview to determine which pages contain the content you want to print.
Take note of those pages and click the Print button in the upper-left
corner of the Print Preview window. Locate the Print Range heading and
select the Pages option. Type the number of the first page you want to
print in the From field and type the number of the last page you want
to print in the To field. For instance, if you want to print just the
first three pages of a Web page’s content, type 1 in the From field and
type 3 in the To field. If your browser doesn’t have To and From
fields, type the range of pages (such as 1-3) in the corresponding
field. Make sure your printer has paper and click Print.