Hi Jay,
Certainly very interesting. I have been examining my images with LProf
http://lprof.sourceforge.net/ Certainly a great software for profiling.
Have a look to this report. You don´t really need any device for
checking temperature. I knew my Jesspos lightbox was far away from a
truly 5000ºK white point. ;-(
*White point near 5360K*
Primaries (x-y): [Red: 0.699787, 0.261772] [Green: 0.192455, 0.807545]
[Blue: 0.105197, 0.019457]
Estimated gamma: [Red: 1.07733] [Green: 0.978428] [Blue: 1.08753]
Loading sheets...
Reference sheet: C:/Documents and
Settings/David/.lprof/target_refs/V030303.q60
Measurement sheet: C:/Documents and
Settings/David/.lprof/temp/meaurement.cgt
Gamut hull: 234 inside, 0 outside, 54 on boundaries
Fitting error (delta E CIELAB): mean=1.40909, RMS=2.14987, 95%%=5.12289,
median=0.924192, MAD=0.410085
Fitting error (delta E CIE94): mean=0.803919, RMS=1.10448, 95%%=2.01674,
median=0.619953, MAD=0.257514
Performing 2-fold cross validation ...
2-fold CV: estimated RMS dE=4.41801, dE94=2.26767
2-fold adj. CV: estimated RMS dE=3.74657, dE94=1.92324
Profile 'C:/WINDOWS/system32/spool/drivers/color/Olympus E-1 ICC profile
for C1g1.icm' DONE!
Regards,
Dave
> This particular meter, a Minolta Color II, does have 3 cells, so that's how it
> got the value to indicate this light box would need a 10M filter. And this
> meter can't handle flash, it needs a longer duration light source.
>
> But now for a digital neophyte question. I see cameras that have multiple
> white
> balance settings. So if you select fluorescent, does it do some adjustment
> for
> the green spike? For that matter when you select a custom white balance, does
> it adjust for RGB or just Red and Blue?
>
> And back to the original purpose. If the E1's white balance CAN compensate
> for
> the green spike, couldn't Dave illuminate a white paper with a light box, lock
> the compensation for that then use that source to light up the IT8.7 slide?
> Or
> am I missing something here?
>
> Jay
>
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