In a previous post I went through setting up a new calibration target in ColorNavigator instead of the slightly questionable defaults. You can read that post here. This post will continue looking at ColorNavigator to help you get the most out of it.
Let’s face it we all need a little validation now and then, and your EIZO ColorEdge is no different. Once a calibration has been made it can be checked with the Validate function. What this does is display various colours on screen, measure them and then compare the colour measurement with what the ICC profile predicted the colour would be, and also it checks how closely the calibration target was acheived. Various validation targets can be used. The simplest is Basic RGB which is fine for most users. ISO 12646 Profile Quality is more thorough, and you can also use external software such as Photoshop to validate against various CMYK press standards, although you need to have the correct colour settings in Photoshop to do this.
Whatever validation target you use you’ll need interpret the results. The target and result values for brightness, white point etc are pretty easy to understand. You should expect no more than very minor deviation from the target. For example if the target brightness was 120 and the result is 119.6 then that’s OK. If the target was 120 and the result is 110 then that shows some kind of problem. As well as the calibration targets the validation also checks lots of colours and gives you a delta e report. Delta e is a measurement of colour difference. The smaller the number the closer the match. You get three different delta e numbers for each colour but the dE2000 is the one to look at really. The maximum dE2000 should probably be less than 2.5, and usually is less than 2. The average should be well below 1 and so should the white. Factors such as ambient light and the measurement instrument you are using will have an influence on the result. If you get high values in your validation report then the first thing to do would be to recalibrate and try again. If you still get values you are unhappy with then try a different calibration target, and then perhaps a different measuring instrument. One weakness of the validation procedure is that if you get a poor calibration due to a faulty calibrator and then validate with that same instrument you may well get a good validation report because the faulty instrument is checking itself. If you can’t get good figures on your validation report no matter what you try then contact your EIZO reseller for advice.
Self Calibration & Self Correction
Some EIZO ColorEdge monitors come with built-in calibration or correction sensors. If you go into the Advanced menu you can activate or deactivate these functions. You should always create a calibration target and do the first calibration with ColorNavigator as this sets the target for later self adjustment. You can set the interval and also schedule self calibration so that the monitor will activate even when asleep, warm up and then calibrate itself. Monitors such as the CX and CS series have self correction sensors that just monitor and adjust the screen brightness so it’s probably wise to do a full calibration with a colorimeter periodically as well. The CG245 CG246, CG275 and CG276 have full calibration sensors and so they can be relied upon to fully adjust the monitor, but still I would recommend doing a manual calibration and validation every so often to make sure everything is OK.
It can be worth changing some of the default preferences. The Timer tab can be used to set how often ColorNavigator will warn you it’s time to recalibrate. 200 or so hours is usually fine, and you can even set Use power indicator of the the monitor and the LED will change colour if you ignore the warning. If you are using self calibration then set the timer to 1000 hours so it reminds you to do a manual calibration and validation. The Measurement device tab can be used to switch the compensation table to Multiple monitor matching, this is very useful if you are trying to match two EIZOs of different models. The Version tab lets you check for updates. it’s always worth keeping ColorNavigator up to date.
The Advanced menu also contains a Manual Adjustment function. It lets you manually change the brightness, whitepoint and colour balance of the screen. Using this function is a really bad idea. If your ColorEdge isn’t matching your prints or not looking like you expected then you need to change your calibration targets or address other areas of colour management such as your lighting or printer profiles. Manually adjusting the monitor may mask a problem but it won’t solve it.
As ever please comment on this blog if you want points clarified, or for me to add in other features of ColorNavigator I haven’t covered.