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: Fri, 12 Sep 2008 14:36:50 -0700 (PDT)
> 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.
Yes and no. Many cameras from many vendors typically store reference gain data in the header, either in the maker note or other TIFF tag. The gains are intended to be used by software when processing the raw data. Color issues are rarely, if ever, baked into the raw data. There __is__ some signal processing to take care of some issues prior to writing the raw data, such as green balancing, but that doesn't really fall into category of colorimetric characterization (I would classify that more into noise reduction).
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