Printing chart RGB

Do not mess up with the chart printing step! There are some trap and here are full steps to print correctly while calibrating your device.

To do before...

These notes will help you to set up your image editing/printing application, and your printer, to print the test charts needed to create your profile. As well as this document you should have the all of the TIFF images created with Coraye Print Profiler. Before you print the charts, make sure that your printer is set up correctly. Use the maintenance utility for the printer to ensure that all the nozzles are working correctly and that they are properly aligned. Remember that the purpose of a printer profile is to optimise the print quality for one printer, using one combination of print settings, one type of ink and one type of paper.

If you change any of these then the profile will give you less than optimum results. If you use different papers you should use a unique profile for each. It is essential that you print the test charts with all color management turned off, both in your image editing software and in your printer. Follow this procedure carefully, consulting the relevant user manuals and Help files if you are not using the same software and hardware that are described here. In the following instructions, text shown in bold italic represents the wording you should see on your computer.

To print yours targets, you can print them from an image editing software e.g.: Photoshop or from a RIP. We now recommend the use of the ACPU for printing the RGB target files . Concerning the CMYK targets files, you have to print them from a RIP.

Adobe Color Printing Utility (ACPU) We now recommend the use of the ACPU for printing the target files. This small application can be downloaded from the Adobe website The download is a small (56kB) ZIP file containing the program and instructions. Versions are available for both PC and Mac platforms. Once the files are extracted, it is more convenient to drag the file “Adobe Color Printer Utility.exe” onto the desktop. You may find it convenient to drag the target files *.tif and onto the desktop too. To run ACPU, just double-click on the desktop icon. This will open a file selection dialog where you can select one of the target files. The selected file will appear in the ACPU window as below.

Click “Print”, select your printer from the drop-down list, and then click “Properties” to go to the printer set-up dialog.

When you get to the printer set-up window, follow the guidance below to disable color management. Once the printer is set up you will return to the “Print” window as above. Just click “Print” and your target should print. Once you have printed the first sheet of the target follow the same procedure to print the second sheet. It will be necessary to set up the printer again, since ACPU does not “remember” printer settings from one print to the next.

Setting up the printerThe first step in setting up the printer is to choose the appropriate paper type and printer resolution in the printer driver. These will depend on the type of paper that you are using - remember that the profile is only valid for this paper, printed with the settings that you choose now.If you don't know how to print your target, I suggest to go on paper manufacturer's web site to get informations to setup your print.

It is essential that you turn off all color management in the printer settings. In the Epson control panel below, this will be found by clicking the Advanced button which will give you another set of options. In this second window you can select the correct paper and resolution. Under Color Management select No Color Adjustment. It is best to save the settings with a descriptive name so that you can recall them easily when you come to print in future. These are the settings that you will use every time you print using your custom profile with this paper.

Other print drivers will be different but the objective is the same - to disable any color management or adjustment in the printer driver. Sometimes the required settings are a bit less obvious. For example, in the Canon driver shown below, you will need to select Manual in the Color Adjustment box.

This will open up other options as shown. Here, all the sliders should be set to zero to avoid any manual adjustment. Not quite so obvious is the Print Type box. This must be set to None otherwise the print driver will apply its own intelligence to the color adjustment, depending on the nature of the image. This would destroy the consistency that we are trying to ensure!

For Hewlett Packard printers, make sure that you choose Application Managed Color from the color management dialog. It is essential that the charts are printed without color management. ACPU will ensure that the file itself is not color managed but it is up to you to disable color management in the printer driver.

After you have printed the chartsWhen you are happy that the charts are correct, leave them to dry. In this time be very careful not to scratch the surface or damage it in any way. Even papers that claim to be “instant drying” can be vulnerable when first printed, and any blemishes in the printed charts can affect the accuracy of the profile. It’s worth taking a good look at the printed charts because they show what your printer/ink/paper combination is capable of. It is important to keep in mind that printer profiling cannot increase the range of colors that you can print. What it will do is to ensure that the colors that you can print are reproduced accurately, that transitions between colors are smooth, and that grays are genuinely gray. If you are sending more than one set of charts be sure to identify them clearly. Any marking must be done near the edges of the prints, outside the black border. Do not mark the prints, or apply adhesive labels, on the back within the printed area.

When the prints are completely dry, you can read it with your spectrophotometer and Coraye Print Profiler.

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