![]() Once you have the pdf, use it for any direct output, such as a proofer, or to make a plate for your printing press so that the colour chart can be printed. When prompted, name the pdf with a clear identifier (output device and date or equivalent) and save it. The choice of reading device will determine the size of colour patches and page format, and the size of output will define how many pages are ganged to a sheet. While in the software, you select a reading device (such as the X-Rite i1 Pro or i1 iO) from the list of devices that the software supports and then provide the dimensions for your output device. You will typically be dependent on the colour management software application that you have chosen to produce a pdf file of the colour chart that your spectro can read. Additional typical accessories for the spectro include a weighted strap and screw-in base for hanging the spectro against the screen of a monitor and a proof mount base with sliding rail for the spectro to read printed colour targets. ![]() The USB cable provides power to the spectro and so should be plugged directly into the computer and not into a peripheral such as a keyboard. Best practice is to use exactly the same instrument for any series of measurements. If you have access to more than one spectro device, be sure that any related measurements are done consistently either with or without the filter. This indicates it has an ultraviolet filter, which acts to remove the impact of fluorescence from optical paper brighteners. The spectro may also be identified (on both the serial number tag and surrounding the light-emitting aperture) as a UV-cut. The packaging will include a certificate indicating the expiry date for the current calibration. When used commercially, the manufacturer recommends that a spectro be returned for factory recalibration every two years. Make sure you confirm that you have the correct baseplate that matches the serial number on your spectro. Each baseplate is uniquely matched to a specific spectrophotometer and marked with a serial number that corresponds to its spectro. It does this by reading the white tile supplied in the baseplate that comes with the spectro. To do this properly, the spectro must calibrate its white point to establish the baseline for interpretation. As described in section 4.3, the spectro works by recording spectral data from incremental slices of the range of wavelengths included in visible light. It can also be mounted in the iO base for automated scanning. The i1 Pro is one of the most common hand-held spectrophotometers used in the graphic reproduction industry. Let’s begin with measurement and discuss the working components of a standard graphic arts spectrophotometer and the colour charts we would use it with. The practical application to print production requires a procedure for measurement, colour profile generation, and the correct use of profiles in the manufacturing process. Colour Management in the Graphic TechnologiesĤ.5 Working with a Spectrophotometer to Read Standard Colour Charts for Output ProfilingĪrmed with our fundamental concepts in colour theory, we can apply these principles to the physical process of colour management.
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