Kodak 'Q' -- RAW, Post Processing & Printing in photography-on-the.net forums

...winded

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Nov 17, 2009 16:13 | #5

Heh! That was my initial response!

I just googled "kodak q" and found out what jr_senator is referring to -- the Kodak Q series are "targets" for calibrating scanners, specializing in certain high-quality Kodak film types.

It sounds like if you have a print version it could work kind of like a Gretag MacBeth chart, in that it has both a color spectrum and a gray scale at the bottom -- you can set the color temp with the gray scale then adjust using the colors.

Do you have one? If so, give it a try, if not, there are other reliable things out there -- you can use a gray card for both setting exposure and white balance, for instance.

Tony
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jr_senator
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Nov 17, 2009 16:38 | #6

I have 2 'Q's. A 4x5 transparency and a 5x7 print. How would I use a gray card (included in the shot) to set correct exposure and WB?

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tonylong

...winded

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Nov 17, 2009 18:51 | #7

A true (medium gray) gray card can be used typically with spot exposure by metering it and setting your exposure accordingly (the camera meter interprets a subject as "medium" which means a gray card in the same lighting as the subject will accurately be centered. If you are using Manual exposure, this enables you to get one properly exposed setting which will be consistent through the scene/orientation to the light.

The 5x7 'Q' won't help with exposure, or with in-camera white balance, but could help with especially a Raw file if it's in a shot in the scene lighting by using the eye dropper in software to set the white balance on the gray scale.

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René Damkot

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Nov 18, 2009 03:52 | #8

If I understand the question correctly: Should be possible similar to calibrating ACR with a McBeth card. You'll just need to know what values to put in...

http://people.csail.mit.edu/ericchan/dp/acr-color-match/
http://people.csail.mit.edu/ericchan/dp/acr/
http://www.photoactivity.com …ratori%20al%20sole_en.asp

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kirkt

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Nov 18, 2009 09:28 | #9

ftp://ftp.kodak.com/GASTDS/Q60DATA/

Here is a product shot from the B&H photo website of one of the Q60 targets:

IMAGE: http://www.bhphotovideo.com/images/largeimages/163309.jpg

from: http://www.bhphotovideo.com/images/largeimages/163309.jpg

Note the ftp address at the bottom of the target - it gives you access to all the data you need to get going.

Here is an example of a data file for an R2 target, with the header and the listing for the gray scale values that run across the bottom of the target.


IT8.7/2
ORIGINATOR "Eastman Kodak Company"
DESCRIPTOR "Q60R2, IT8.7/2 Data Files, 5x7 inch Endura"
CREATED  "March 26,2009"
MANUFACTURER " Eastman Kodak Company"
PROD_DATE "2009:04"
SERIAL  "2009:04 BATCH AVERAGE DATA"
MATERIAL "Endura Product Family"
KEYWORD "MEAN_DE" # Mean Delta E of samples compared to batch average
#
# STDEV_DE in this data set is the average of the standard deviations of
# L*, a* and b*.  It is used to derive an estimate of the chi-squared
# parameter which is recommended as the predictor of the variability of
# DELTAE.  SEE FILE ON THIS DISK CALLED CHI-SQ.*
#
NUMBER_OF_FIELDS 12
BEGIN_DATA_FORMAT
SAMPLE_ID XYZ_X XYZ_Y XYZ_Z LAB_L LAB_A LAB_B STDEV_X STDEV_Y STDEV_Z
    MEAN_DE STDEV_DE
END_DATA_FORMAT
NUMBER_OF_SETS  264
BEGIN_DATA
#ID    X      Y      Z      L      A      B    S_X   S_Y   S_Z   M_DE  S_DE

GS1  63.22  65.59  52.67  84.79  -0.06   1.57  0.09  0.09  0.14  0.09  0.06
GS2  56.12  58.20  47.36  80.85   0.01   0.77  0.10  0.11  0.18  0.12  0.07
GS3  49.96  51.84  41.98  77.19  -0.07   1.01  0.12  0.12  0.14  0.13  0.08
GS4  43.66  45.38  36.80  73.14  -0.27   0.89  0.05  0.06  0.14  0.13  0.07
GS5  38.35  39.93  32.35  69.42  -0.47   0.89  0.11  0.11  0.19  0.20  0.12
GS6  32.64  33.91  27.66  64.89  -0.21   0.53  0.10  0.10  0.14  0.12  0.08
GS7  28.53  29.56  23.51  61.27   0.12   1.64  0.09  0.11  0.14  0.16  0.10
GS8  24.07  25.06  20.23  57.14  -0.41   0.94  0.10  0.11  0.14  0.19  0.12
GS9  20.49  21.35  17.25  53.33  -0.48   0.84  0.09  0.07  0.16  0.26  0.16
GS10 17.08  17.80  14.14  49.25  -0.43   1.41  0.14  0.15  0.12  0.21  0.13
GS11 13.90  14.52  11.59  44.97  -0.59   1.15  0.11  0.11  0.11  0.27  0.15
GS12 11.67  12.23  10.04  41.57  -0.85   0.17  0.08  0.09  0.09  0.17  0.10
GS13  9.39   9.80   7.90  37.49  -0.51   0.74  0.07  0.08  0.10  0.24  0.15
GS14  7.45   7.83   6.44  33.61  -0.91   0.07  0.06  0.06  0.06  0.21  0.13
GS15  5.99   6.30   5.17  30.16  -1.02   0.15  0.05  0.05  0.06  0.24  0.15
GS16  4.44   4.70   3.81  25.86  -1.21   0.43  0.03  0.03  0.04  0.19  0.13
GS17  3.45   3.61   2.97  22.33  -0.47   0.03  0.02  0.03  0.02  0.24  0.14
GS18  2.52   2.64   2.16  18.55  -0.61   0.22  0.02  0.02  0.02  0.19  0.12
GS19  1.73   1.79   1.37  14.39  -0.16   1.32  0.01  0.01  0.01  0.20  0.13
GS20  1.21   1.27   0.98  11.03  -0.21   1.01  0.02  0.02  0.01  0.21  0.15
GS21  0.94   0.99   0.74   8.88  -0.43   1.29  0.02  0.02  0.02  0.21  0.13
GS22  0.74   0.78   0.63   7.00  -0.27   0.29  0.01  0.02  0.01  0.18  0.12

You could shoot the target, and then in L*a*b mode in Photoshop, use a curves adjustment layer and the curve color picker to click on various color or gray patches and adjust the L, a and b curves to get the desired L*a*b values specified for that patch of the target (drop a color picker info spot on the patch you are adjusting and read the values from the info window). Then you save that curve and apply it to the images you have shot under the same lighting conditions. Maybe?

There is also an open source app called Argyll that will do this for you automatically and output an ICC profile - you need to tell it what target you are using and feed it the data that is contained in the above ftp files, and it should generate the profile for you.

See:

http://www.argyllcms.com/

This is probably the way to go. Essentially you would be profiling your input device (your camera) for that specific lighting condition, hopefully resulting in better color rendition. I wonder if Kodak has software to do this specifically for these targets.

Good luck!

Kirk
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images: http://kirkt.smugmug.com

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