As I said, surrogates, not masters. Masters are un-cropped, first
acquired digital  images. Any corrections to the original digital image
makes it a surrogate.

Color corrections are necessary once you start making reproductions of
the masters for print or online display. Those copies of the masters
should contain any adjustment layers, because you do not want to go back
to the digital master to do adjustments every time you get a request for
a reprint, etc.

In any case, the archiving of digital anything is a never ending
process. Be ready to keep on top of the digital imaging arena for the
foreseeable future. Formats change, new ones get adopted, support for
outdated formats seizes, etc. Technology advances do not rest. 
Hope this clarifies the situation.

Tom Arnautovic
Collection Database/Imaging Specialist
Crocker Art Museum
916-264-1176

>>> rhow...@getty.edu 10/13/04 08:56AM >>>
> The bigger the file size (70MB - 250MB is not uncommon) the better.
In
> other words, the bigger the file the more information on the object
is
> captured. Also, focus on one master format, i.e. TIFF is a very
common
> format in this regard (do not compress the files) and if you apply
color
> corrections on surrogates of the original scan, place the adjustments
on
> layers (yes, TIFF now supports layers), rather than flattening the
image
> to save file space.

Tom,

I would recommend against this; I assume you're referring to the
layered TIFF that Photoshop (since v7) will output? These are virtually
(if not completely) unsupported outside of Photoshop in some forms -
they do keep a flattened version of the entire document for apps that
don't support layers, but then you lose the main benefit (the layers)...
but in my experience, the main benefit of layered TIFF from PSD is for
using ZIP compression, which can really reduce the size of a complex
layered document, and ZIP compression is also not well supported.

In general, I wouldn't recommend keeping these as your masters, but
they can be handy. PSD may be significantly larger for an equivalent
layered file, but it's also much better supported, and understood - many
folks still don't get that TIFF allows much more than a simple flat
image.

- R


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