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Posts: 11 | Thanked: 50 times | Joined on Dec 2009
#2771
Originally Posted by joerg_rw View Post
I guess the results from your test are good enough to determine which color binning we should use for the LEDs, however if it doesn't cause too much of a hassle to you, a short reference colortemp test with flash mode would be welcome - to extend the flash duration you should cover the cam lens.
Today I made a measurement of the flash firing in "photo mode". Target and tools are the same as before, distance approx 2cm (but not identical to yesterday), and the command used was spotread -f

Code:
 Result is XYZ: 48914.080359 52252.452852 48530.191314, D50 Lab: 918.315492 -39.497321 -64.951465
 Apparent flash duration = 0.347616 seconds
 Ambient = 52252.5 Lux-Seconds, CCT = 5744K (Delta E 8.002467)
 Closest Planckian temperature = 5507K (Delta E 7.012451)
 Closest Daylight temperature  = 5626K (Delta E 3.509126)
 Color Rendering Index (Ra) = 69.8 [ R9 = -36.2 ]
 Television Lighting Consistency Index 2012 (Qa) = 47.7
I noticed I can save the spectrum directly from spotread, and got this:

Code:
SPECT  

DESCRIPTOR "Argyll Spectral power/reflectance information"
ORIGINATOR "Argyll CMS"
CREATED "Mon Mar  7 01:24:06 2016"
SPECTRAL_BANDS "36"
SPECTRAL_START_NM "380.000000"
SPECTRAL_END_NM "730.000000"
SPECTRAL_NORM "1.000000"

NUMBER_OF_FIELDS 36
BEGIN_DATA_FORMAT
SPEC_380 SPEC_390 SPEC_400 SPEC_410 SPEC_420 SPEC_430 SPEC_440 SPEC_450 SPEC_460 SPEC_470 SPEC_480 SPEC_490 SPEC_500 SPEC_510 SPEC_520 SPEC_530 SPEC_540 SPEC_550 SPEC_560 SPEC_570 SPEC_580 SPEC_590 SPEC_600 SPEC_610 SPEC_620 SPEC_630 SPEC_640 SPEC_650 SPEC_660 SPEC_670 SPEC_680 SPEC_690 SPEC_700 SPEC_710 SPEC_720 SPEC_730 
END_DATA_FORMAT

NUMBER_OF_SETS 1
BEGIN_DATA
2.081521 1.525198 2.413494 12.92703 83.77788 365.2856 1032.702 1440.313 775.7580 303.4139 162.2774 169.6131 295.8362 506.8517 706.9819 824.8828 872.8501 886.0428 883.5148 865.9997 827.0998 763.7556 683.8440 597.0863 510.9309 429.2598 354.9107 288.9295 232.3115 183.9067 142.4513 109.7032 85.02940 66.42006 52.56601 44.18413 
END_DATA
Using specplot on the file I got (a different wording of the same thing):

Code:
Type = File 'flash.sp' spect 0 [Black]
XYZ = 0.936111 1.000000 0.928764, x,y = 0.326755 0.349055
D50 L*a*b* = 100.000000 -4.903794 -8.064053
CMYV density = -0.301030 -0.301030 -0.301030 -0.301030
CCT = 5743.863889, VCT = 5506.973550
CDT = 5744.942428, VDT = 5625.857563
CRI = 69.8 [ R9 = -36.2 ]
TLCI = 47.7
CIEDE2000 Delta E = 1.461264
and the following plot: base64 -d > plot2.png

Code:
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J706X+nV+ep8pVfnq/OVXp2vzld6db46X+nV+dXOK9LKC0ZJh9um69BKnFE6P6FjOy91L60MRbM/
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MP29UFnoMENvSOmclN5hO89TuuyQ1Xk+k13hVB4q3eqoxtAZMh3MlZoZumYozoNb49nOC0dx3pOd
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Cr/yCXT9J3R6l0Dna+idi/7vBPp/19D5Wvpva5znru45j3d+vqWPzf5G/yYh+/+wKr+I3jNSOsei
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5+QWdezyt9TsfG6/J9BFMh1m6IOMp0MyXc3QpWc87if74fenf/+W/oN9X4fH4/q47HxZ9vcd73F+
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aln2lx2/znnN0Zv66Pdxp7aWLcwOGJVfat3Ljk+jN2h05435Z+gMj96R0lW680yjTb63Af7sCjH7
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TR/z/F7p1fnqfKVX56vzlV6dr85XenU+2vk7pj/9vDH3iRysHdZvzMsL9gdQj4/WwmPbmxt6fNoa
GxofmAvHd+/ykv2gpbENKdudSW8HYxv2h2+lthb2/c7Y0DAusjZkLtTjosOFvh/Xe//zc38wX+S2
lUZa+wdZpLYW9iOwNxwfHxsb2psL9TCu257ow/Bs/n1n0Yf+swn4bNO3n0P0wz5E317ox/0+RN/u
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Xdr0/pU+rhR0fm86b33JYnzqPuR8v7NfqEHppbw4f2wfQ8f7k9mY218wGbbWwunxPj426dbCftjK
2s5XeqWXpf8fAEWSnQnyxXwAAAAASUVORK5CYII=
Let me know if you need any more measurements.
 

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