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Poster Printer

Here are a list of steps one must take in order to print from the Biofrontiers poster printer.

High Quality Poster Printer

  • Black and White: $7.00 per square foot.
  • Color: $7.50 per square foot.
  • Maximum Poster Dimensions: 60" X 72" 

 

PowerPoint

is our most commonly used application for creating poster-sized documents. PPT has a maximum document dimension size limit of 60". Two of the more commonly used sizes are 36" by 48" and 36" by 56". If you wish to create a poster (in PPT) that will print larger than this, you should create a smaller document with the appropriate height-to-width ratio that will scale up proportionately. For example, to end up with a poster that is 36" by 72" (height to width ratio of 1:2), size your poster in PPT to be 24" by 48" (also a ratio of 1:2). The document size can be specified in the “Page Setup” dialog.

See the “Graphics Guidelines” below for a brief tutorial regarding how to prepare graphics for use in posters and manuscripts. Please read this if you don't understand under what circumstances the different graphics formats are appropriate (jpeg, png, eps, etc.), or are having issues of output quality.

 

Placing Graphics in Word Processing and Poster Documents

We often have to embed pictures of various kinds into documents. These guidelines outline the best

file formats to use and the best techniques for getting your graphics from the application in which you

created them to your word processing or poster document. This should help you obtain the best quality

printed results.

There are two general kinds of graphics files, bitmaps and vector or object-based. A bitmap picture

is a rectangular matrix of dots (pixels) where each dot is a single color. When a bitmapped picture is

printed a certain size the printed picture can be described as having a certain resolution, or number of

dots per inch (dpi). If a picture is 1000 pixels wide and is printed 5 inches wide the horizontal resolution

in dpi is 1000/5 or 200 dpi. Examples of bitmaps are digital photographs and scanned pictures of

graphs or drawings. Vector or object-based graphics files are composed of mathematical descriptions

of the object and letter shapes that make up the figure. The concept of resolution in dots per inch

does not apply to them, and when printed they will print at the maximum resolution of the printer being

used. It is possible to insert bitmapped objects into vector based graphics files, and these inserted

bitmapped objects follow the rules as other bitmapped pictures. Examples of vector/object based

graphics are graphs from most graphing packages and drawings created using programs like Adobe

Illustrator.

This following table shows the optimal resolution to use for the various graphics file types when printing.

 

* Older versions of Microsoft Office (2003 and earlier for PC and 2004 and earlier for Mac) do not handle pdf graphics

properly, so you should use eps files for inserting graphics into these programs.

 

 

Using Bitmaps

In order to get the best quality print from a bitmap file while keeping the size of the

file to a minimum, the size of the pixels or dots should be matched to the size of the dots that the

printer uses. Most black and white laser printers are capable of printing at 300 or 600 dots per inch

(dpi). B&W lasers cannot print shades of grey (e.g. photographs) so they must print black dots with

the density of the non-overlapping dots determining the darkness of a region. This makes it so the optimum

resolution for photographs is lower. The color laser can print dots of any color at 300 dpi. The

poster printer is an inkjet printer that can print 1200 dpi using eight different colors of ink. Thus to print

colors that are combinations of the eight “primary” colors it must use an area of non-overlapping dots

of the primary colors plus the white of the paper. We have determined that the quality of printed photographs

does not improve significantly beyond about 300 dpi in the original image. Using higher

resolutions will make your file much larger without significant improvement in the printed picture quality.

However if you have a picture for a poster in which fine detail is very important, you might try scaling

it to 600 dpi.

The preferred file format for photographs is jpg because this format utilizes compression algorithms

that reduce the file size substantially without noticeably reducing the quality of the picture. Information

is lost during this compression and during scaling so you should keep your original photo file intact.

The jpg compression does not work very well for line drawings like scanned in graphs or other pictures

with high contrast sharp edges, so the preferred file format for these is png. The png file format

uses a loss-less compression scheme that works very well with line drawings. Scaling these files

down does result in loss of information so you should keep originals of these also. If the application

you are using does not support png files, a very similar alternative format is gif.

Printing images at higher resolutions than suggested in the table above will not improve significantly

the quality of printed version but will increase the size of your document file and may increase printing

time substantially.

 

Scaling photographs and other bit-mapped images

You can use an application like GraphicConverter

or Photoshop to scale photographs to match the optimal size for the printer you are going to

use. The following table shows a few examples of scaling pictures to best fit the printers.

 

 

 

The rule of thumb to follow is that you never need to scale a picture up to a higher resolution but

should scale down if necessary to bring it to the optimal resolution of the printer you will be using.

If the checkerboard on the left below is your original 4 x 4 pixel graphic and you scale it up to 8 x 8

pixels, you will get the picture on the right. The pixels are smaller and the resulting file will be larger,

but the picture content remains the same.

 

Using Vector Based Graphics – Because they contain mathematically defined shapes, vector based

graphics will print at the maximum quality of the printer independent of how they are scaled in the

document. While there are many file formats that are vector and object-based, the preferred format

for inclusion into documents like Microsoft Word and Powerpoint files is encapsulated postscript or

eps. With newer versions of Microsoft Office programs (2007 or later for PC and 2008 or later for

Mac) you may use pdf files instead. They are generally simpler to make and can be inserted into the

newer versions of Word and Powerpoint with good results. Older versions of Office programs would

turn inserted pdf graphics into low resolution bitmapped graphics not suitable for publication.

EPS and pdf files contain postscript printer instructions. Postscript is a computer programming language

that is used to describe text and graphics on a printed page. It is built-in on almost all laser

printers. With eps files the postscript instructions are “encapsulated” with additional information that

that makes them easier to insert into other documents. Many applications cannot display the graphics

represented by the postscript instructions within an eps file unless the file includes a “preview” representation.

 

The preview included in an eps file may not be a very

high quality representation of the graphics but the

postscript will be used when the document is printed.

The resulting printed picture will be at the highest quality

the printer is capable of producing.

Many graphics applications allow you to create eps or

pdf files directly by selecting options under “Save As...”

or “Export...” menus. If the application you are using to

produce your vector/object-based graphics does not support

saving files as eps, then you can use Adobe Acrobat (the standard or pro version, not the free

Acrobat Reader) to create the eps file but first you must save the graphics as a pdf file. On the Macintosh

(OSX) there is a “Save As PDF...” button in the standard “Print...” dialog. On a PC you can use

the free PDFCreator software (http://sourceforge.net/projects/pdfcreator/) or the “PDFmaker” printer

selection that comes with Adobe Acrobat. Once you have the pdf file, open it with Adobe Acrobat and

use the options in the “Save As...” dialog to create the encapsulated postscript file. In later versions of

Adobe Acrobat the “Settings...” button in the “Save As...” dialog also allows you to designate that the

eps file include a preview image.

While these procedures somewhat complicate the process of placing graphics into documents, they

will guarantee that you get the best quality output on the printers in CLIPR.

 

Inserting Pictures into Documents – While it is tempting to simply use “copy and paste” to move

graphics from the application you used to create them into the application you use for word processing

or posters, this does not guarantee a good quality printed document. It is best to save the graphics

out into the appropriate file format as described above, and then use menu commands to insert

the picture file into the document. Most applications will allow you to “drag and drop” the picture file

into the document, but is some cases this is the same as the “copy and paste” method and does not

guarantee good quality results. In Microsoft Office applications select Insert ➙ Picture ➙ From File...

from the menus which will bring up a dialog in which you locate and select the picture file.

If you want the convenience of using “copy and paste” or “drag and drop” insertion of pictures into

documents, then you should first test this technique using a small document on the printer you will be using for your final copy.

 

How to prepare your poster

One of your poster's dimensions must be less than 60 inches or less. 
For example, 36 x 48, 48 x 56 or 60 x 72 (please inquire about printing sizes larger than 60x72)

  • For best results, use Adobe Illustrator or Microsoft Powerpoint.
  • Before you begin, create your blank document and set your planned size ("Page Setup" in Powerpoint, "Document Properties" in Illustrator).
  • Consider using our blank Mac & Windows PowerPoint Posters.
  • Leave room on the margins.
  • Resonable font sizes for a poster:
    • Titles: 72
    • Sub-titles: 40-48
    • General Text: 28-38
    • Captions: 22-28
  • Check your images, we often see poor results when people use low resolution images downloaded from some site on the web! Remember, your poster will be around ten times larger when printed than what you see on your computer screen. CU offers medium and high quality images and logos for free to use in your presentations and posters.
  • Please email posters to jscbbposters@colorado.edu (include dimensions and a speed type number)

Allow 2 hours for most posters to print. Once the print job has completed you will receive an email to pick up the poster.

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