Re: ColorChecker Digital SG question
Re: ColorChecker Digital SG question
- Subject: Re: ColorChecker Digital SG question
- From: Iliah Borg <email@hidden>
- Date: Sun, 26 May 2013 09:27:14 -0400
Dear Gerhard,
On May 26, 2013, at 6:22 AM, Gerhard Fuernkranz wrote:
> 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.
Cosine law, for those who fill the frame, too (digital vignetting). Sensor non-uniformity, too.
> 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...
It is the main question for me.
> 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,
It can't be, even in relatively simple cases.
--
Best regards,
Iliah Borg
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