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Modify Keywords
The Modify Keywords command adds, modifies,
or renames keyword metadata in the image header. This command works
with any displayed image and with image files opened from a FITS
format file. New keyword data may be added, existing keywords may
be modified, and keyword names may be changed to other names. If
Action = Add and the keyword already
exists in the image header, its value is replaced by the value in
the table.
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The Modify Keywords command opens from
the Image Window > Process >
Calibrationmenu and  button
on the Main
Toolbar. The "immediate" form, shown first, opens
when an image or image set is displayed in the top-most window. The
general form can be used to select source images from folders,
windows, or by matching templates.
Modify Keywords Properties
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Profile
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Select a
profile to save and preset the table entries.
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[Select]
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Opens the
Select Source Images dialog to choose images from an
image window, folder, files, name template, or a Mira File
List.
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Action
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Specifies the action to take for the specified
keyword.
Add
If the Keyword does not exist in the
image header, it is added.
If the Keyword already exists in the
image header, its value is changed to the entered Value.
Rename
If the named Keyword exists in the
image header, its name is changed to the specified Value. The Comment
is not used.
(none)
Specifies that there is no action taken for this line of the table.
Use this option if you want to keep a keyword in the list but not
apply it at the current time.
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Type
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Specifies the type of keyword as a String, Number, or
Integer. These are described a
separate table below.
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Keyword
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Specifies the name of the Keyword. You can use
either a standard or conventional name or your own private keyword
name. For list of standard and conventional keywords, see
FITS Keywords.
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Value
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Specifies the keyword change to be made in the
header. What is changed depends on the Action.
Add (Action):
The Value is saved as the new value
of the keyword.
Rename (Action):
The Value replaces the keyword name. The previous value and comment in
the image header are preserved.
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Comment
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Optionally, for a new keyword. The comment is
saved only when Action=Add. The
comment is ignored for Action=Rename.
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Keyword Types
The Type of a keyword refers to the kind of
value that will be saved in the image header.
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String
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The keyword value is saved as a string between
single quotes.
The String type is
also used for date, time, and angle in HMS/DMS format.
Example: 'My great data'
'-30:12:14.566'
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Number
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The keyword is saved as a real (floating point)
number including a decimal point or exponential notation.
Examples: -1.456E-12
825.421 152.
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Integer
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The keyword is saved as an integer value with no
decimal point.
Examples: 68455
-452
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Logical
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The keyword is saved as a logical (Boolean) value,
either T or F. The SIMPLE
keyword is a typical example of this type of value.
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Related Topics
Calibration Menu
FITS Keywords
Add Metadata
Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All
Rights Reserved.
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