When complete you see a screen that lets you view the monitor before and after calibration has taken place. Store these settings as an ICC or ICM profile that will be called up each time the computer is started up (Macintosh) or each time an ICC compliant application is loaded (Windows). With the dark, mid-tone and white points set, your monitor is now calibrated. When the centre square is as neutral as possible, store the measured white point. Clicking on the left square will add blue to the centre square, whilst the right will add yellow. Selecting measure will display three grey squares on screen. Generally, setting the Mac or Windows defaults will be OK, however the Adobe gamma control panel will allow the white point to be measured approximately. These are:Ħ500K - D65, the accepted Windows default This is a pre-set value for all monitors, and is usually a choice of standard CIE colour temperatures. This is when equal values of red, green and blue at full intensity produce white on your monitor screen. Next, make sure your white point matches that of your monitor. With this done, the monitor gamma should be entered in the panel, either Macintosh default (1.8) or Windows default (2.2) depending on the platform. Red, green and blue squares are provided, and a slider under each square should be adjusted until the centre square disappears. These should always be set on a colour by colour basis, so make sure the view single gamma only box is unticked. The next menu allows you to set the mid-tone values. These can then be entered in the custom phosphors dialogue box. The menu gives a choice of a set of pre-defined phosphors, Trinitron for example, or you can contact the monitor manufacturer and obtain the x-y r, g and b numeric values. Now enter the phosphor setting best suited to your particular monitor if you know it. You have now set the dark point of your monitor. Tape over the monitor controls so they can't be moved accidentally. Now adjust the monitor's contrast control to maximum, and set the brightness control so that you can just discern a difference between the two centre squares. Select the stored monitor profile that appears to match your monitor closest from the list in the load menu. Then, open the Adobe gamma control panel, and choose the assistant for a first calibration. It has the advantage that it is available to both Windows PC and Mac users, and is automatically installed in the Control Panels folder or directory by default both on the Mac and in Windows 98.īefore starting calibration, turn the monitor on and leave for at least thirty minutes so that everything can stabilise before adjustments are made. The way out of this is to use the Adobe Gamma calibrator, and this program comes as part of Adobe Photoshop from version 5.0 onwards. This means a system-wide calibration can't always be used on the Windows PC. Because of the way some PC graphics cards work, monitor gamma settings are not always software adjustable, especially when the computer shares memory between system and graphics functions. In Windows, calibration changes will generally only appear when ICC compatible applications are run, and not necessarily at system start up. Whatever application software is used, the monitor will always display a calibrated image, and this is one of the major advantages of the Apple system. On the Macintosh, a monitor calibrator creates an ICC profile that is used at system level to correct the monitor image at system start up. There is a fundamental difference in the way that monitor calibration is handled in the Mac and Windows platforms. Some monitors, like the Radius PressView and Apple ColorSync, include calibration software that can be used to set up the monitor in the first place, and then automatically update it as the phosphors age. There are expensive hardware and software packages which measure colour directly off the screen. There is a wide range of tools available. The monitor image is the only view you have of a digital file, and the quality of all image retouching depends on how accurately the monitor displays it. How to ensure what you see on the computer's monitor is accurateĬalibrating the monitor is the first, and perhaps the most important step in setting up a digital workstation.
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