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<p class="title">DRAFT DICTIONARY</p>
<p class="title"><font class="smalltitle"></font>CBF/imgCIF Extensions Dictionary</p>
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<p class="title">Draft version 1.5 for comment</p>
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<h5>Image dictionary (imgCIF) version 1.5.4</h5>
<h1>_array_intensities.linearity</h1><b>Name:</b><br /><tt class="cifdefinition">'_array_intensities.linearity'</tt>
<p><b>Definition:</b></p><pre class="cifdefinition">
The intensity linearity scaling method used to convert
from the raw intensity to the stored element value:
'linear' is linear.
'offset' means that the value defined by
<a href="Iarray_intensities.offset.html" class="itemlink">_array_intensities.offset</a> should be added to each
element value.
'scaling' means that the value defined by
<a href="Iarray_intensities.scaling.html" class="itemlink">_array_intensities.scaling</a> should be multiplied with each
element value.
'scaling_offset' is the combination of the two previous cases,
with the scale factor applied before the offset value.
'sqrt_scaled' means that the square root of raw
intensities multiplied by <a href="Iarray_intensities.scaling.html" class="itemlink">_array_intensities.scaling</a> is
calculated and stored, perhaps rounded to the nearest
integer. Thus, linearization involves dividing the stored
values by <a href="Iarray_intensities.scaling.html" class="itemlink">_array_intensities.scaling</a> and squaring the
result.
'logarithmic_scaled' means that the logarithm base 10 of
raw intensities multiplied by <a href="Iarray_intensities.scaling.html" class="itemlink">_array_intensities.scaling</a>
is calculated and stored, perhaps rounded to the nearest
integer. Thus, linearization involves dividing the stored
values by <a href="Iarray_intensities.scaling.html" class="itemlink">_array_intensities.scaling</a> and calculating 10
to the power of this number.
'raw' means that the data are a set of raw values straight
from the detector.
</pre>
<p><b>Type:</b> code</p>
<p class="pack"><b>Mandatory item:</b> yes</p>
<br /><b>The data value must be one of the following:</b><br /><br />
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>linear</tt>
</td><td width="50%"> .
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>offset</tt>
</td><td width="50%"> The value defined by _array_intensities.offset should
be added to each element value.
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>scaling</tt>
</td><td width="50%"> The value defined by _array_intensities.scaling should be
multiplied with each element value.
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>scaling_offset</tt>
</td><td width="50%"> The combination of the scaling and offset
with the scale factor applied before the offset value.
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>sqrt_scaled</tt>
</td><td width="50%"> The square root of raw intensities multiplied by
_array_intensities.scaling is calculated and stored,
perhaps rounded to the nearest integer. Thus,
linearization involves dividing the stored
values by _array_intensities.scaling and squaring the
result.
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>logarithmic_scaled</tt>
</td><td width="50%"> The logarithm base 10 of raw intensities multiplied by
_array_intensities.scaling is calculated and stored,
perhaps rounded to the nearest integer. Thus,
linearization involves dividing the stored values by
_array_intensities.scaling and calculating 10 to the
power of this number.
</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>raw</tt>
</td><td width="50%"> The array consists of raw values to which no corrections have
been applied. While the handling of the data is similar to
that given for 'linear' data with no offset, the meaning of
the data differs in that the number of incident photons is
not necessarily linearly related to the number of counts
reported. This value is intended for use either in
calibration experiments or to allow for handling more
complex data-fitting algorithms than are allowed for by
this data item.
</td></tr></table>
<p class="pack"><b>Category:</b> <a href="Carray_intensities.html" class="catlink">array_intensities</a></p>
<h4 align=left>
HTML version of draft dictionary created by modified version of makedicthtml by B. McMahon
from modified version of imgCIF dcitionary 1.3.2 which is subject to the following copyright:
</h4>
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