Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: "edmund ronald" <email@hidden>
- Date: Fri, 12 Sep 2008 23:04:58 +0200
Lars,
You certainly have a way with words :)
I have to agree with you re. characterization vs. calibration.
Re. cameras, my *feeling* is that for hi-end cameras, there is a
characterization of the physical sensor and electronics in factory,
followed by the burning of values in a ROM that normalizes the
behavior of each sample. In other words, the camera is calibrated in
the factory and Raw is really pre-cooked.
Thanks for helping me calibrate my terminology :)
Edmund
On Fri, Sep 12, 2008 at 8:48 PM, Lars Borg <email@hidden> wrote:
> Edmund,
> It seems you mean characterization.
> calibrate : To adjust or bring into balance.
> Calibration is commonly used to mean adjusting a device so its performance
> is within tolerances. A printing press is brought into spec through
> calibration.
> characterize : To describe the qualities or peculiarities of
> Characterization is commonly used to mean measuring a device's (or process')
> performance, such as its deviation from the norm. When it's meaningful, you
> usually calibrate the device before you characterize it, as this usually
> reduces device drift in the obtained characterization data.
> Profiling, the process of creating a profile for a device, is (not always)
> based on measurement data obtained from characterization of the device or
> process.
> You can calibrate a light meter, but can you really calibrate cameras?
> You can say that you calibrate the sensor production process to keep the
> production variations to a minimum, then you characterize the production
> process to measure how much variation you have in the sensors on average or
> individual sensors.
> have fun,
> Lars
> At 12:56 PM +0200 9/11/08, edmund ronald wrote:
>
> I'm not very good on terminology, I'm using the words mostly
> intechangeably. Certainly, any operation done on Tiffs and not Raw
> should only be called profiling.
>
> Calibration usually refers to a process closer to establishing
> characteristics of hardware. In that sense, I'd call measuring a
> sensor's reponse a calibration. There are devices out there which will
> do this for you.
>
> Of note however, with a modern LCD with LUTs one changes the behavior
> of the display by writing in the LUT. That is a certainly a
> calibration operation as it has changed the hardware's behavior.
>
> Cameras are a different story. Assuming you're the manufacturer, yes
> you will calibrate the unit in that sense too before shipping it :)
>
> Edmund
>
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