How to extract white balance multipliers? - page 2 - RAW Shooting and Processing - CHDK Forum
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How to extract white balance multipliers?

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Offline philmoz

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Re: How to extract white balance multipliers?
« Reply #10 on: 31 / January / 2016, 14:58:45 »
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Quote from: markanini on 31 / January / 2016, 04:37:38
I figured it out! The AsShotNeutral values are simply inverted related to G. For example take the raw 1037 805 2478 RGB values, scale them so that G is 1, in this case by diving by 805. This give us 1.288199 1.000000 3.078261. Now for R 1/1.288199 and for G 1/3.078261. The final command is:
exiftool -AsShotNeutral="0.776277 1 0.324858" "20080118 - IMG_0942.DNG"
Perfect match with JPEG!

The 'As Shot Neutral' tag should already be in the DNG files created by CHDK.
Are you saying it is wrong for the A570?

Phil.
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CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)
  g7x2 (1.01a, 1.01b, 1.10b)
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Offline markanini

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Re: How to extract white balance multipliers?
« Reply #11 on: 31 / January / 2016, 15:02:57 »
The field was missing.
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Offline philmoz

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Re: How to extract white balance multipliers?
« Reply #12 on: 31 / January / 2016, 15:30:40 »
Quote from: markanini on 31 / January / 2016, 15:02:57
The field was missing.

Unless you are using an ancient version of CHDK, I don't see how this is possible.

Phil.
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CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)
  g7x2 (1.01a, 1.01b, 1.10b)
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Offline markanini

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Re: How to extract white balance multipliers?
« Reply #13 on: 31 / January / 2016, 16:01:02 »
The shots were taken in 2008.
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