Originally Posted by juice shop
Yes, surely even with a spectro there is no way of actually "measuring" the physical effects of light w/o it hitting sensors, conversions taking place and individual sample deviation driving things further away from an absolute ideal. I assume that moving to the iD3 wil improve things greatly from where I am right now, especialy improving consistency in grayscale and overall gamma.
The DTP94 you are using now, since its a very old instrument (with un-shield filters which has been drifted for sure), its not a meter you can trust, its not having such good low light capability and requires periodically dark readings, to have stable readings over the time. With i1Display PRO as an upgrade you will be fine, it has shield options and great low light capability, it will be a lot faster and more accurate to use.
Originally Posted by juice shop
Is OLED amongst the technologies for which the iD3 reference table can be considered "good enough" w/o generating a specific correction?
Also, from what I gathered, spectros like you are hinting at are good reference devices for a colorimeter. However, I have no idea of the inner workings of such a device, will there be drift over time also as is the case with all colorimeters, as they are based on photodiodes behind filters that will degrade over time and therefore alter the response of these diodes over time?! For an amateur that has only a couple of displays to work with, it WOULD be a significant investment, so would be great to get your insight into this, thanks!
Spectro's are great tools to create unique meter correction tables for colorimeters.
Each display has it's own unique spectral response, this is why you need to create a meter profile correction for each display separately.
Colorimeters are coming with some tables created in their factory labs.
For example using i1Display PRO OLED table with LG OLED, don't expect to see improvement to your measurements because X-Rite has created that OLED table for RGB OLED displays like Sony Trimaster EL or FSI OLED Broadcast Monitors etc. The LG OLED's are WRGB and their spectral response is different.
Colorimeter filters are trying to closely match the standard observer curves, but once the display’s spectra response has different weighting curves from those that the colorimeter has calibrated from the factory, you will have problem measuring that display.
Professional colorimeters like Klein K-10A or Colorimetry Research CR-100, specifies what display model used per each of their available correction tables, but with i1Display PRO its just saying the display tech, not the display models used, but you can see what displays used per each mode here
When you have just the i1Display PRO with WRGB OLED, its better to use the default Generic CMF table (which called RAW XYZ in CalMAN).
Generally the spectro's are coming with a certificate of performance (not coming with a certification the i1Studio/ColorMunki Photo spectro's), and X-Rite recommend to re-calibrate periodically.
Newer i1PRO2's features a Built-in Wavelength Calibration Technology (Self-Check & Correction).
Built-in wavelength calibration technology allows for self-diagnosis of the position of the optical grating in respect to the sensor during white calibration, eliminating worry about your device’s measurement accuracy.
i1PRO2 has 128 sensors binned into 41 10nm increments. The mechanical alignment feature will make sure the 41 increments are accurately aligned with the 128 sensors.
Special Green Filer and LED Performs instrument self-check on every Calibration.
i1PRO2 has a reference spectrum of the (green) wavelength LED stored in its firmware, during the wavelength calibration the driver computes a wavelength offset in the sensor to wavelength interpolation tables to ensure that the measured spectrum of the green LED matches that of the firmware reference. Too large a shift and it will error out. Zero shift and nothing has moved in the hardware.
Instrument can automatically self-diagnose and correct for small shifts as well as identify re-calibration needs.
Damaged instruments can be identified for required repair.
Older generations (i1PRO1) don't have that feature, they just use the calibration plate to take a dark reading only.