Thread: Neo900 - finally a successor of N900
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jetmarc@hotmail.com is offline jetmarc@hotmail.com
2016-03-06 , 03:15
Posts: 11 | Thanked: 50 times | Joined on Dec 2009
#2767
Originally Posted by joerg_rw View Post
Yes, of course. Highly appreciated, many thanks for helping with this

Ok I did this today, and this is what I got.

Target: My N900 was bought some 3-6 months after market introduction. The aparture of the camera/flash unit had a blue-colored tint on the edges, which was neutralized with black ink. To measure the flash color, I turned on the "flashlight" mode. I am not sure if this is a low current mode and if the current influences the color, but it is easier to measure. Let me know when this is not good enough.

Tools: x-Rite i1Pro2 and ArgyllCMS 1.8.3

Measurement 1: spotread -a -N

For this measurement I used the ambient light adapter and had the phone shining into the sensor from a distance of maybe 2 cm.

Code:
 Result is XYZ: 10381.329780 11168.856635 10074.093410, D50 Lab: 542.634253 -29.250888 -29.109195
 Ambient = 11168.9 Lux, CCT = 5675K (Delta E 9.687946)
 Suggested EV @ ISO100 for 11168.9 Lux incident light = 12.1
 Closest Planckian temperature = 5403K (Delta E 8.488890)
 Closest Daylight temperature  = 5517K (Delta E 4.974792)
 Color Rendering Index (Ra) = 70.1 [ R9 = -37.7 ]
 Television Lighting Consistency Index 2012 (Qa) = 48.5
Measurement 2: illumread -v -N

This measurement consists of 3 individual measurements. The first is of the flash shining directly into the sensor, and I used the a similar setup as before (ambient light adapter, approx 2 cm). The second measurement is reflected from paper, and I used vanilla office printer paper and an angle of 45 degrees approx. The third measurement is the paper color itself, and I use the normal spot reading setup. The last two measurements are supposed to clue about the UV contents of the light source.

Code:
SPECT  

DESCRIPTOR "Argyll Spectral power/reflectance information"
ORIGINATOR "Argyll CMS"
CREATED "Sun Mar  6 02:25:02 2016"
SPECTRAL_BANDS "45"
SPECTRAL_START_NM "290.000000"
SPECTRAL_END_NM "730.000000"
SPECTRAL_NORM "1.000000"

NUMBER_OF_FIELDS 45
BEGIN_DATA_FORMAT
SPEC_290 SPEC_300 SPEC_310 SPEC_320 SPEC_330 SPEC_340 SPEC_350 SPEC_360 SPEC_370 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
0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00490145 0.00177026 0.00431980 0.0214035 0.145008 0.653737 2.039361 3.369266 1.993886 0.779962 0.403550 0.404197 0.686909 1.171644 1.634942 1.913347 2.028934 2.063459 2.059977 2.020874 1.931819 1.784170 1.599621 1.397492 1.196757 1.008129 0.835002 0.681009 0.547155 0.433853 0.336795 0.259777 0.201203 0.157002 0.124581 0.104186 
END_DATA
This file can be examined using specplot:

Code:
Type = File 'test2' spect 0 [Black]
XYZ = 0.931246 1.000000 0.900338, x,y = 0.328878 0.353159
D50 L*a*b* = 100.000000 -5.762902 -5.919376
CMYV density = -0.144735 -0.240183 -0.112879 -0.219696
CCT = 5650.126305, VCT = 5387.721842
CDT = 5651.454724, VDT = 5501.851749
CRI = 70.1 [ R9 = -37.0 ]
TLCI = 48.5
CIEDE2000 Delta E = 1.901252
The last command also creates a plot image: base64 -d > plot.png

Code:
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Hopefully this helps for your project. I really liked the N900. To me it was a little laptop in my pocket, with SSH openvpn and rdesktop. Now I am on Android and I really miss these things. On Android, you can only do what you are supposed to do (much like on the N9, which ended the the drawer after just 2 days). Sometimes I still use the N900 as laptop replacement on short trips, and I wish someone would offer a modern device for developers.
 

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