Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Lars Borg <email@hidden>
- Date: Fri, 12 Sep 2008 11:48:46 -0700
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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