Originally Posted by Plasma54321
I am still confused as to why the luminance and gamma plots look so similar. The luminance plots are all most on top of each other. The gamma has some differences with the RED data darker (gamma higher) for most of the chart with the exception of 90% point.
Why are is this data reasonably good, when the RGB Levels, color temperature,and CIE diagram data clearly indicate a big problem?
What am I missing?
How would you adjust or correct for this in HCFR? Can an Excel spreadsheet be used to adjust things?
Luminance and RGB are 2 different things. The meter can read the proper brightness (amount of light or luminance) correctly but not the proper color.
Gamma is the difference in luminance form 0 -100% and has nothing to do with color, so it can be accurate and the color reading be very wrong. You can not fix this without using a known good reference spectror meter, and if you had such a meter, you would probably just toss the D2 in the trash and use the spectro since the speed difference would be of no great issue.
If you are not familiar with meter profiling this is something that is done in the software if it support it. I have no idea what HCFR support.
To profile a meter:
The software tell you to ready your reference meter and you place it so it is looking at a known spot on the screen, hopefully taking into account Field of view difference between the 2 types of meters.
Then you display a Red, Green, Blue and white pattern and take readings of each.
Next you set up the target meter that you want to make better so it sees the same spot on the screen.
You do the same readings on the target meter.
The software makes a table of the difference between what the reference meter sees vs what the target meter sees.
This difference table is then applied to all readings made by the target meter during the calibration.
This fix is only accurate on this one display where the reading were taken.
Hope that clears it up.