RAW vs White balance

Started Nov 20, 2006 | Discussions thread
Jonas B Forum Pro • Posts: 14,596
I took 15 pictures...

and found nothing.

Subject: A Kodak grey card that filled the viewfinder
Light: So called daylight bulbs
Tripod: yupp
ISO: 200, 400, 800, 1600, 3200
f-value: manually, set to 1.2 (wide open) for all pictures
Shutter time: manual, 1/250, 1/500, 1/1000, 1/2000 and 1/4000
White balance: first serie: daylight, then tube light D, finally ordinary bulbs
Camera: *ist DS
format: raw

I used the little Russian command line utility and got 15 of these pictures:

Here are the pictures with white balance set to daylight:
ISO200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2135.jpg
ISO400: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2136.jpg
ISO800: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2137.jpg
ISO1600: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2138.jpg
ISO3200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2139.jpg
-----
Here are the pictures with white balance set to Fluoroscent D:
ISO200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2140.jpg
ISO400: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2141.jpg
ISO800: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2142.jpg
ISO1600: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2143.jpg
ISO3200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2144.jpg
-----
Here are the pictures with white balance set to Tungsten:
ISO200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2145.jpg
ISO400: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2146.jpg
ISO800: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2147.jpg
ISO1600: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2148.jpg
ISO3200: http://photos.imageevent.com/jonas_b/dprmonthly/0611/2149.jpg

To me it was interesting to see that I got "striped" histograms allready at ISO800. And, as expected, no difference in the distribution between the channelswhen using different settings for the white balance. I write expected as this is what Í have been believing in for nearly 2 years now. But, I'm still open for an altered reality. Did I something wrong with my test setup? Let me know and I'll redo it tomorrow. For now I assume nothing has changed. I'll have another look at that striped histogram using Photoshop later.

Comments?

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regards,

Jonas

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