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Dynamic low 135 hrs.zip 382.970703125k . file
Low lamp dynamic 160 hrs.zip 383.095703125k . file
Nat High 230 hrs PRO1 readings of LT cal.zip 414.755859375k . file
Nat High 230 hrs PRO1 cal.zip 435.1220703125k . file
PRO1 to LT offset.zip 9.8916015625k . file
Nat High 230 hrs LT offset measure of PRO1 cal.zip 383.298828125k . file
Im so glad you did the comparison of the i1pro to the LT. Ive been having this delema with my LT meter, where everything seemed too warm (too much red). Your results seem to agree with what Ive been seeing with my own eyes with my LT. When I do my calibration, the grayscale has always appeared redder than it should. If your LT is reading like mine, then my eyes are not deceiving me. Your i1pro measurements show that your LT meter had red at close to 10% too high throughout the grayscale! (and this impacts the color locations as well)
Whats interesting about that, is Ive tried to set my grayscale by eye and it required reducing red by roughly 11% from where the LT said it should be! This agrees very well with your results.
As far as setting up the conversion matrix, here is what you do. (Looking at your calibration files, they werent setup properly to do the conversion offset, like your 75% saturation reference triangle in there)
1) Take only a grayscale, and Primary and Secondaries measurement with the LT meter. Do not do saturations.
2) Save this file.
3) Take the exact same set of measurements with the i1pro meter.
4) Save this file.
5) Go to the i1pro measurement file, and click the Reference measure box.
6) Go to the LT measurement file, and choose Advanced, XYZ Coordinate Adjustment Matrix, Compute conversion matrix from reference document, then click yes.
Now if you do a new set of measurements with the LT meter, have the XYZ adjustment box checked, and it should match the original i1pro file very closely. You have now trained the LT to the i1pro.
Once you do this, can you share those files? Id be very interested in trying out that conversion matrix with my LT just for kicks to see if it looks better by eye to me with my meter.
PRO1 to LT offset.zip 9.8916015625k . file
I calibrated my natural mode, high lamp, with your LT offssets, and it gave me the best calibration I've seen yet to date. I know there is meter to meter variance, but my LT meter seems to behave similar to yours. (similar red error)
I noticed that my greens, blues and yellows have much more of a natural looking hue especially, and grays seems much more neutral than the red push I was seeing before. If I get a chance, I'll attach my results tomorrow.
Thanks for sharing your conversion matrix. I look forward to tackling Dynamic now that I'm happy with the conversion matrix that you created. Hopefully the matrix(offset) will be universal for me and allow Dynamic to look much better as well. With 1600 hours on my bulb, I don't use natural mode much, and rely on Dynamic for the extra lumens.
LT offset to PRO1 Dynamic Low.zip 4.7333984375k . file
That's great news about the conversion matrix working for you. Attached is the dynamic conversion matrix.
I did quite a bit of testing last night and ran gray scale and gamma for 3 different scenarios for this dynamic matrix and it correlated quite well with the Pro1. (I checked it against the Saturday dynamic conversion, made some gamma and gray scale adjustments with the Pro1 and then checked this, and then zoomed my lense in as small as I could and ran the Pro1 and the LT offset and they were quite close). I wasn't going to attached all of the files unless you would like to see them. I also went back and checked the conversion matrix (offset) for nat high and it again lined up quite well. So I'm pretty confident that we need at least 2 offsets: Natural and Dynamic.
I get worried when I calibrate a few days later and the Y value is different that just a few day earlier. Sometimes it is higher and sometimes it is lower. I think I'm aligning the meter the same way each time, but for some reason my cd/m^2 can vary quite a lot (1-2 at 100%). Anyway it is reassuring that the dE's between the different days is low, so I'm getting more comfortable with the Pro1, but it is harder to use than the LT (at least for me it is).
In the attachment I also have a gray scale of a Pro1 calibration, so you can see that the dE's are pretty good.
Let me know what you think.
10-26-09 75% Natural High Lamp, i1pro Adjusted.zip 1.5498046875k . file
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