Re: Media Testing for maclife.de
Re: Media Testing for maclife.de
- Subject: Re: Media Testing for maclife.de
- From: Eric Chan <email@hidden>
- Date: Sat, 13 Sep 2008 05:11:52 -0700 (PDT)
> > Calibration would bring the data from the device into
> a standard
>
> No, that's the task for the profile (or at least,
> should be in a clean
> workflow).
I disagree on this point, Uli. In general, for most devices calibration data is both stored and applied separately from actual profile data.
For example, for Epson large format printers there is calibration data generated and applied using Epson ColorBase software, which is separate and independent of ICC profile data. The idea being that if two printers of the same model are calibrated using ColorBase (effectively linearizing each channel), then you should be able to share a single ICC profile between them with equally good results.
It has been suggested that for digital cameras, the appropriate analogy would be white balance, which (most of the time) is just effectively scaling the individual channels in camera-native space before applying the profile data. That is only part of the story. If there is reference gain data for the raw file that varies from unit to unit within a given model, then this reference gain data should also be applied as a "calibration step" -- separately and independently from any (ICC) profile data that is later applied.
Any measurement/profiling that takes place without such calibration being applied is effectively "burning in" a particular unit's calibration into the measurements & resulting profiles.
Going back to the printer analogy: if you didn't linearize the printer first (e.g., run Epson ColorBase) and just proceeded with printing a standard profile target and building a profile (e.g., using your favorite profile-building software), then that profile should work well on that unit. Any peculiarites of that particular printer unit are effectively "burned into" the profile that you've built. But if that unit behaves differently from another unit of the same model, you would not expect the profile you built for the 1st unit to necessarily work well for the 2nd.
Hope this is clear.
Eric
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