Summary:
These
guidelines
indicate
recommended
requirements
for
master
TIFF
image
files
scanned
from
printed
source
documents
for
PALMM
projects. TIFF
files,
created
through
a
process
of
scanning,
are
stored
as
masters
and
used
to
derive
other
file
formats
for
web-delivery.
Specifications:
|
File
Format: |
ITU
TIFF
(Tagged
Image
File
Format)
Reference: |
|
Encoding: |
6.0 (ITU
T.6)
Specification: TIFF
6.0
Specification (PDF
file
version) |
|
Compression: |
Uncompressed |
|
Bit-depth: |
Appropriate
to
the
source
document
and
for
intended
uses
(e.g.,
facsimile
reproduction) |
|
DPI: |
Appropriate
to
the
source
document
and
for
intended
uses
(e.g.,
high
resolution
printing,
optical
character
recognition,
etc.) |
|
Scale
/
Image
Dimensions: |
Scan
scaled
to
100%
of
source
document
dimensions |
| Color
Space: |
sRGB
Scanning
software
calibrated
to
standard
RGB
palate |
Process:
No
single
method
of
scanning
is
recommended. Any
method
appropriate
to
the
source
document
and
the
intended
uses
of
the
electronic
image
may
be
acceptable. Compliance
with
the
principals
and
recommendations
of Moving
Theory
into
Practice:
Digital
Imaging
for
Libraries
and
Archives (Anne
R.
Kenney
and
Oya
Y.
Rieger
[Mountain
View,
CA
:
Research
Libraries
Group,
2000])
and
Cornell
University's Digital
Imaging
Tutorial are
highly
recommended.
For
optimal
image
capture,
periodic
calibration
of
scanning
devices
and
monitors
is
recommended. Both Moving
Theory
into
Practice and
Cornell
University's Digital
Imaging
Tutorial:
Quality
Control provide
additional
information. In
addition,
use
of
scanners
supporting
automatic
calibration
(of
reflected
or
transmitted
light)
as
a
part
of
image
preview
and
scanning
is
highly
recommended.
Use
of
standard
gray-scale
or
color
bar
is
recommend
for
capture
of
photographic
images;
images
from
transmissive
sources
(i.e.,
slides,
photo-negatives,
transparencies,
etc,);
and
other
works
originally
rendered
for
shading
or
color
content.
Capture
of
the
image as
found is
highly
recommended. Image
manipulation
(e.g.,
application
of
Gaussian
blur)
should
be
limited
to
secondary
processing,
preferably
after
the
native
scan
has
been
saved
and
only
in
preparation
for JPEG
derivation.
Quality
Control:
Quality
control
should
play
a
prominent
role
in
scanning
operations. Visual
inspection
together
with
a
query
of
the
file
header
should
be
completed
by
spot
check. Spot
check
requires
inspection
of
every
image
in
thumbnail
view
and
of
no
less
than
10%
of
the
images
in
full-image
view.
A
variety
of
factors
effecting
on-screen
and
print
legibility
should
be
examined. For
additional
guidance,
we recommend
reading
Cornell
University's Digital
Imaging
Tutorial:
Quality
Control.
|