Preparing Images for Better Reproduction on Laser Printers and Photocopiers
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- 2007.01.26
If you're like a lot of teachers, you create handouts and tests for your students. Integrating photos and drawings into your handouts is a way of breaking up the monotony of an all-text document and emphasizing important points.
Unfortunately, when you print a color photo on a laser printer or photocopy it, subtle shading and detail in the photo are often lost, leading to a high-contrast blotchy picture. Sometimes it's hard to tell what it is.
Some photocopiers have a "photo" mode, but that doesn't help you when you laser print a document not worth copying in the first place. This article will show you how to prepare your photos on your computer so they'll print well, copy well, and retain most of the original detail.
Let's face it: You're printing a black and white picture on your laser printer. Even though the original image may be in color on your computer screen, black and white is still the choice of mass-produced copies. So how do you prepare the picture?
Most Macs come with a copy of GraphicConverter, a valuable shareware program that Mac users have used since before OS X to manipulate images and convert images between file types.
Here's an example of how to do the conversion on the fly using an image you'd like to use in a document.
I found a picture on Wikipedia Commons to use as an example. Here's a photo of Alexei Leonov, a famous Russian cosmonaut, holding a drawing of an American astronaut. Note the dark flight suit and low-contrast image in the drawing. If you print this image on a standard laser printer, the darks will become darker and the white areas will wash out.
Next, I opened GraphicConverter and hit Command-J, which copies the clipboard to a new document (that way I don't mess up the original image). Then I picked Effect > Black&White > Dither... and used the default setting, Random Matrix with an 8x8 grid (600 dpi).
That generated this image (reduced here):
You'll note that some of the texture in the flight suit is missing, but lighter colors, such as Leonov's face and, in particular, the drawing, become more contrasty and easier to see. If you print this article on a black & white laser printer, you'll be able to see the difference between the print quality of the two pictures.
Here's what dithering, which converts the image to black and white with no grays whatsoever, looks like close up:
The resulting image can be copied from GraphicConverter and pasted in Word documents, Examview Pro test writing software, or any other document creator you are using.
Go forth and used more graphics to your documents.
Jeff Adkins is a science teacher who isn't afraid to state his preferences in computing platforms. In his classroom he has everything from a beige All-in-One to a a G4 XServe, and they all work together nicely. He calls himself the "poster child for technology integration" in the classroom. He was the 2006 Outstanding Educator of the Year for the California Computer Using Educators (CUE) organization. He also maintains a site for astronomy teachers at www.AstronomyTeacher.com.
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