Originally Posted by alamagar
Thks for your answer Rahzel. I still have some issues not clear to me.
- What do you mean by " Calibrate the meter using a 30% stimulus pattern"?. In curtpalme guide he says:
"LCD or Plasma: Click "Calibrate internal sensor offsets" and place the sensor on a flat non-porous opaque surface. A black surface is preferred. The inside of a black DVD case works great. Make sure it's flat and no extra light is getting in there! Select "OK" to calibrate."
I can't see exactly the point with 30% stimulus pattern. Do you mean load the 30% white APL or windows pattern and click calibrate?
- Also I assume is necessary to calibrate the meter even when you are working with front projection. Is it correct?
- Regarding periodic or not periodic calibrations I guess you mean it is only necessary to calibrate the meter once for a long time (say months) before recalibrate it again, correct?. Curtpalme guide asserts
"When you go to take final critical readings, you may want to manually recalibrate again to ensure everything is perfect" and
"You'll have to calibrate next time you start up ColorHCFR or unplug/replug the Eye-One too of course"
but I think it refers only to i1D2/LT old colorimeters.
- Thank you for the advice on refresh type for plasma. I didn't use it before.
- Regarding correction matrices. I assume if I use correction matrix is it needed to redo the calibration of the TV with that values loaded on "advanced->XYZ coordinates adjustament matrix->...", is it correct?
I guess is better to publish this post on "fork-of-hcfr-started-whats-needed" thread.
1. The i1D2 has to be calibrated with a black surface. The i1D3 needs to be calibrated using a white patch, and it's recommended to use a 30% white pattern (window, field, APL.. whatever you're using). With plasmas, you should use windows or maybe APL. LED/LCD or projector, you can use fields.
2. Yes you need to calibrate the meter before you start each session. When you create a new calibration in HCFR, it will ask you this.
3. When I say 'periodically calibrate the meter' I mean the HCFR internal sensor calibration. The i1D2/LT needs to be re-calibrated every 15-20min to ensure accuracy, but AFAIK, you don't have to do this with the i1D3.
Actually getting your meter re-calibrated/serviced by comparing it to an accurate meter (like a spectro) and getting offsets to compensate for meter drift is a different topic. This doesn't need to be done that often (several months, or years) because the i1D3 has sealed filters. To prolong your meter, it's best to store it in a dark, cool and dry place. I store mine with incandescent packs in a ziplock bag.
4. Yes, if you use a correction matrix, you will have to redo the calibration. There's a checkbox on the top right of HCFR that says "XYZ adjustment". You can see the how the matrix/offsets affect the measurements by simply checking or unchecking this box.
IMO, it's fine to use the i1D3 in contact mode with a plasma, as long as you let the meter warm up a bit on the screen. In my experience, even if you started measuring right away without letting the meter warm up, the difference in measurements is minimal. 20min or 30min tops should be enough time for the meter to warmup IMO.
Some other changes you will have to make in HCFR. Go to Advanced -> Preferences:
-On the General tab, uncheck 'use measured colors (when available)'
-Click on the References tab and make sure you select REC 709 for HD. You can also set your target gamma here.
-Click on the Advanced tab and check 'do not use luminance in delta E formula'
Would definitely be nice if there was an updated guide for HCFR. It's a very effective free tool, but one of the problems is that it takes a lot of searching and reading to find out how to set it up properly.This post
has a good summary of the things that should be changed in HCFR.Edited by rahzel - 12/26/12 at 11:19am