Pixel Scale Sensitive FITS Keywords
Several commands that scale the image pixel size
(see list below) modify the spatial scale of the pixels.
Maintaining the spatial image scale after these commands may
require certain
FITS header keywords to be adjusted accordi according
to the operation.
Commands that Modify the Pixel Size
Block Average Filter
Block Sum Filter
Scale Image
Spatial Scale Keyword Modifications
FITS header Keywords in the table below are updated
or added, as per the Status column.
Note the number 1 or 2 following some keyword names. these are used
to refer to axis 1 (columns increasing) or dimension 2 (rows
increasing).
Keyword
|
Origin
|
Status
|
CRPIX1
|
FITS Standard
|
Modified if present
|
CRPIX2
|
FITS Standard
|
Modified if present
|
CDELT1
|
FITS Standard
|
Modified if present
|
CDELT2
|
FITS Standard
|
Modified if present
|
CD Matrix (WCS)
|
FITS Standard
|
Modified** if present
|
COL_BIN
|
Early FITS consensus
|
Added*, or Modified if present
|
ROW_BIN
|
Early FITS consensus
|
Added*, or Modified if present
|
SECPIX
|
Early IRAF consensus
|
Modified if present
|
SECPIX1
|
Early IRAF consensus
|
Modified if present
|
SECPIX2
|
Early IRAF consensus
|
Modified if present
|
CCDBIN1
|
Origin unknown
|
Modified if present
|
CCDBIN2
|
Origin unknown
|
Modified if present
|
XPIXELSZ
|
Camera control software
|
Modified if present
|
YPIXELSZ
|
Camera control software
|
Modified if present
|
PSF-FWHM
|
Mira
|
Modified if present
|
*The COL_BIN and
ROW_BIN keywords are added by the
Block Average Filter and
Block Sum Filter.
The CD Matrix is
present in images that have a
World Coordinate System calibration.
Related Topics
FITS Kewords
FITS Format Definition
Working with FITS Format
World Coordinate System Keywords
Mira Pro x64 8.71 User's Guide, Copyright Ⓒ 2024 Mirametrics, Inc.
All Rights Reserved.
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