mFixNaN1

Usage

Overview

Converts NaNs found in the image to some other value (given by the user), or converts a range of supplied values into NaNs.

Options

-d level

Turn on debugging to the specified level (1-3)

-b

Check for non-physical boundary area (e.g. the corners of an Aitoff image) and correct them.

-v NaN-value

Value to use in place of any NaNs

Arguments

in.fits

Input FITS image file

out.fits

Path of output FITS file. To run in "count" mode without creating an output file, use a dash ("-") for this argument.

minblank maxblank

If the "-v" switch is not used, mFixNaN will replace all pixel values between minblank and maxblank with NaN.

Result

[struct stat="OK", rangeCount=rangeCount, nanCount=nanCount]

rangeCount is the number of pixels that were found between minblank and maxblank, if they were specified. If not (i.e., NaNs were removed and replaced with value), nanCount is the number of NaNs removed.

Messages

Examples

A FITS image with BITPIX -64 (double-precision floating point) was generated without using NaNs; all "blank" pixels are represented by very small negative numbers. This can throw off initial attempts to display the image with a proper stretch, and does not conform to the FITS standard. To replace all those "blank" pixels with NaNs:

mFixNaN original.fits NaN.fits -4.61169e32 -4.61169e10

[struct stat="OK", rangeCount=1321, nanCount=0]

To convert those NaNs back into a single pixel value:

mFixNaN -v -4.6e32 NaN.fits blankval.fits

[struct stat="OK", rangeCount=0, nanCount=1321]