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Color laser printer sample page how to#
Color laser printer sample page pdf#
Color laser printer sample page driver#
Color laser printer sample page software#
Color laser printer sample page code#

Color laser printer sample page driver#

Select Printer Properties from the pop-up menu or right-click the printer driver icon and select Properties from the pop-up menu. Select Start on the Windows task bar, and then select Devices and Printers. If the Control Panel is in the Classic view, double click Printers. If the Control Panel is in the Category view, select Printer under Hardware and Sound. Select Start on the Windows task bar, and then select Control Panel. Right-click on the corresponding printer driver icon. Select Start on the Windows task bar, and then select Printers and Faxes. The test page will vary depending on which version of Windows you're running.įind your version of Windows below and go to that section to follow the steps

Color laser printer sample page how to#

Here's how to print a test page using a Mac ®. Special thanks to the California Consumer Protection Foundation for funding the project.These instructions are for a Windows computer. Join EFF to support our work on privacy, anonymity, and free speech issues at the intersection of law and technology.You can find contact information for your printer manufacturer - or manufacturers of devices you're considering purchasing. The Seeing Yellow project from the MIT Media Lab is helping individuals get in touch with printer companies to express privacy concerns and ask the companies to turn off the tracking and stop building surveillance features into communication technology. What's worse, some printer companies have assumed that people who object must be counterfeiters. It's outrageous that manufacturers make secret deals to compromise our privacy. Contact manufacturers via the Seeing Yellow site.

Color laser printer sample page pdf#

You can download a PDF file from our web site, print test sheets on your color laser printer, and send them to us in the mail.

Send EFF your print samples EFF is continuing to collect sample output from color laser printers to help our research.

You can help spread the word just by showing your friends that the dots are there. Some people even express skepticism that these tracking techniques really exist. Despite repeated media interest - and limited acknowledgments by printer companies - the existence of yellow tracking dots and similar digital fingerprints is still a complete surprise to almost everyone. Now that you've seen the dots, what can you do? For instance, you can try the following to sharpen the color contrast between the dots and the page: > import Image > blue = Image.open(scan.tiff).split() > blue.point(lambda x: (256-x)**2).show() From a Python prompt, run > import Image > Image.open(scan.tiff).split().show() to see a greyscale image formed from the blue channel's intensity. You can also try converting to greyscale, by mapping the blue channel's value to intensity: with ImageMagick, run the following command: $ convert -fx b scan.tiff grey.png You can also do this interactively in Python if you have the Python Imagining Library (PIL) installed. With ImageMagick, run the following command at a command line (represented here by the $ prompt): $ convert -channel RG -fx 0 scan.tiff blue.png This creates a new image blue.png containing only the blue channel. In the channels tab, deselect the Red and Green channels. In GIMP, go to Layers, then Channels, then Paths. Here are two ways of examining the blue channel with free/open source software: 1.

Color laser printer sample page software#

A wide variety of image-processing software can perform color separations. The dots can be seen easily by enlarging the scanned image, or by performing a color separation in software and examining the blue channel. Modifying the scanner isn't necessary, since it already has a blue light. Scan your printed page on a color flatbed scanner at 600 dpi this makes the dots visible in the scanned image. For further information, or to share your findings, please visit us at. If you don't have the necessary equipment for a particular step, go on to the next one. In this instructable, we'll describe three different ways to see the tracking dots your printer produces: with a blue light, with a microscope, or with a scanner. These codes reveal which machine produced a document and, in some cases, when the document was printed or copied. Most color laser printers and color copiers are designed to print invisible tracking codes across every single printed page of their output.

Sounds like something from a spy movie, right? Unfortunately, the scenario isn't fictional.

Color laser printer sample page code#

Imagine that every time you print a document, it automatically includes a secret code that could be used to identify the printer - and, potentially, the person who used it.