Re: ColorChecker Digital SG question
Re: ColorChecker Digital SG question
- Subject: Re: ColorChecker Digital SG question
- From: Gerhard Fuernkranz <email@hidden>
- Date: Sun, 26 May 2013 12:22:14 +0200
Am 26.05.2013 01:58, schrieb Iliah Borg:
On May 25, 2013, at 7:22 PM, Thomas Lianza wrote:
The patches there to allow software to correct for uneven lighting on
targetÅ .
Works only if the target is perfectly flat. If it is not, and it is usually the case, such attempt of correction may do more harm than good.
Well, but what's the difference, eventually? Regardless whether uneven illumination, and/or a non-flat object surface, and/or vignetting, all of them lead to uneven intensity captured by the camera. So the correction of the uneven intensity should deal with all these cases, independent of the root cause.
Whether or not the amount and distribution of the multiple white patches is sufficient in order to establish a sufficiently accurate model for the spatial relative intensity distribution across the extent of the image of the target is a different question...
And I've also doubts whether the characterization of the spatial intensity distribution can be always easily separated from the color characterization of the camera, particularly if one does not make any a priori assumptions about the camera (i.e. if the camera behavior might be arbitrarily non-linear). One has certainly better cards in the hand if one can already rely on some a priori knowledge about the camera (e.g. if we know that it is granted that the raw data are sufficiently linear and that the R, G, and B channels are sufficiently independent).
Best Regards,
Gerhard
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