[PATCH v1 1/1] Documentation: Add first version of the tuning-guide

[Kieran Bingham]

Quoting Stefan Klug (2024-08-13 15:50:19)
> Hi Kieran,
> 
> Thank you for the review. I marked most comments as done. They will be
> included in the next version. There was only one comment with a response
> from my side.
> 
> On Tue, Aug 06, 2024 at 05:55:06PM +0100, Kieran Bingham wrote:
> > Quoting Stefan Klug (2024-08-06 15:44:41)
> > 
> > > +To get good images with real black, that black level needs to be subtracted. As
> > > +that level is typically known for a sensor it is hardcoded in libcamera and does
> > > +not need any calibration at the moment.
> > 
> > "As the pedestal value is typically known" (we don't know the electrical noise
> > component)
> 
> I'm not sure here. To my understanding some sensors (e.g. AR0521)
> regularly measure the optical black and adjust the internal regulation.
> This would then the electrical noise component also.
> 
> > 
> > Is it hardcoded though? Can't it be overridden by the tuning file still?
> 
> Yes, that is still possible. I added a sentence for that.

Does that regulation happen in a way that we have to read the value and
account for it on the ISP ?

Anyway, I suspect you can handle any update here better than me ;-)

--
Kieran