On 6/1/09 16:35, "Sam Macomber" <s...@macomber.com> wrote:
> RAW format is all the information captured by the camera's sensor in
> an unaltered state(though sometimes lossless compression is used,
> depends on the camera). To generate a TIFF that sensor data has to be
> altered and when you do so information is lost.
Raw data from the sensor is in the form of electron counts from each
pixel of the array. Each pixel is further divided into cells - usually four
- which are filtered to be sensitive to the red, green and blue areas of the
visual spectrum - one red, two green and one blue in the vast majority of
digi capture - though Kodak tried one red, one blue and six green in the
early days....
<http://www.epi-centre.com/reports/9306cs.html>
Conversion to tiff or any other format on import into an image editor
will not affect the raw data unless the original is destroyed after
conversion. Unfortunately sensor data is not the only form of image data
called 'raw' - some proprietary systems use the term 'raw' very loosely for
uncalibrated binary data - hence the compression.
For archiving images I use the Fuji CD-R printable Inkjet Black UV Pro
which is recommended for the purpose....
<http://www.fujifilm.co.uk/recmedia/site/product/product.asp?pid=145>
not easy to get hold of and not cheap but a pod of one hundred goes a
very long way.
Pete
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