Originally Posted by RajinderGill
4) You can evaluate adjustments and issues with a test disc that has suitable patterns (check Ted's disc first as that has the most patterns and they are very helpful on these projectors). Suggest checking red ramps especially on this series of JVC projectors as that is where most of the issues lie (see number 5 below).
I agree this with, it's true that each model needs different handling.
Imagine a scenario that you are hiring to your living room 5 different pro calibrators to calibrate your projector, all of them will only use your meters to calibrate, not their own meters, after the end of each calibrator session, if you write down the menu settings each calibrator used, if you compare at the end these 5 menu setting lists you will see that they are not matching, each one calibrator used different method to calibrate your display.
The same time that the 5 post-calibration reports can be so similar... the image will be slight different... if you swap these 5 memories you will see differences...
This is happening because each calibrator used other method to provide you low dE numbers, If you load some Color Reproduction Patterns, probably you will notice differences in color ramps, clipping bars, color steps etc..
The best of these 5 calibrations settings is the one that the calibrator used with the best way the combination of your internal display controls.
Each available internal calibration control settings that a display has are not always working as expected...Some controls are introducing image anomalies, others have safe working range (for example they are not introducing problems if you use them only at +-2 value of adjustments only), other display controls must not using them, because they are breaking the display color management system or producing non-linearity to display performance, banding, strange artifacts etc.
That's why I added so many Color Reproduction Patterns
to my calibration disk, for the users to verify their controls reactions after using some controls or to check if the combination of internal display calibration controls are not introducing problems to the display.
So I'm suggesting anyone to check also after modification some Grayscale ramp or grayscale steps of my disk (or other disk), to see if the controls have added problems to linearity of the steps, banding or other problems....with this way anyone will be able to start learning each display's contols safe working range, what to touch/not touch, because not all controls are working perfectly.... and a lot of times, specific combination of controls can be tricky and can introduce problems in picture.
These problems in image is something that the 21-Point Grayscale or 5-Point Saturation or Color Checker reports can't display to the user, that's why its important to use some Color Reproduction Patterns after the end of the Calibration or during the calibration, and try to find by viewing them with our eyes for problems: Look for smooth color graduations, distortions, discoloration, clipping, banding, posterization, crushed shadow details, raised black levels.... something that the measurements/pretty calibration dE reports can't show.