Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Andrew Rodney <email@hidden>
- Date: Thu, 11 Sep 2008 08:28:27 -0600
On Sep 11, 2008, at 7:10 AM, Eric Chan wrote:
As an analogy, when I typically profile a printer...
Its an excellent analogy because it illustrates just what the steps
are in terms of what's being used (an instrument) to measure what (a
combo of paper in ink if you will). There's still a good deal of
extrapolation necessary but the results are often what we want and a
decent "fingerprint" of device behavior. Very little like this is
happening with camera profiling when you consider the process and the
original data, the huge role of the Raw converter and its settings,
where and how the software building the profile gets the data, the
target and its representation of the scene characteristics etc.
There's a heck of a lot more of this extrapolation going on!
In most cases today, you are grabbing the data that comes out the
back end of a raw converter, after it has been rendered using some
non-specified algorithm (e.g., tone mapped, usually with some non-
linear brightening and contrast-boosting curve).
Then you have someone putting a "rating" on the resulting profile that
itself is the result of this processing with absolutely no though
about these rendering settings! Its a bit like someone writing a
review of different quality clams by tasting 5 different Restaurants
clam chowder. Its only part of the recipe albeit an important one.
On Sep 11, 2008, at 4:56 AM, edmund ronald wrote:
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.
And what exactly are you calibrating? Measuring something alone isn't
calibration in my book. That's far closer to profiling. Profiling
doesn't affect the device, it measures and describes its
characteristics as you say. When we calibrate a display, something is
changed, but not when we profile it.
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.
So based on your two above points, what's being calibrated with the
sensor? And no, cleaning the sensor isn't calibration in my book.
Andrew Rodney
http://www.digitaldog.net/
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden