1.1.1.0 image.newimagefromimage

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image.newimagefromimage - Function

1.1.1 Construct an on-the-fly image tool from a region of a CASA image file

Description

This function applies a region-of-interest to a disk image file, creates a new image file containing the (sub)image, and associates a new image tool with it.

The input disk image file may be in native CASA, FITS(Float, Double, Short, Long are supported), or Miriad format. Look ?? for more information on foreign images.

If outfile is given, the (sub)image is written to the specified disk file.

If outfile is unset, the Image tool actually references the input image file. So if you deleted the input image disk file, it would render this tool useless. When you destroy this on-the-fly tool (with the done function) the reference connection is broken.

Sometimes it is useful to drop axes of length one (degenerate axes). Use the dropdeg argument if you want to do this.

The output mask is the combination (logical OR) of the default input pixel mask (if any) and the OTF mask. Any other input pixel masks will not be copied. Use function maskhandler if you need to copy other masks too.

See also the subimage function.

Arguments


Inputs
infile	Input image file name. Required.
	allowed:	string
	Default:
outfile	Output sub-image file name. Default is unset.
	allowed:	string
	Default:
region	Region selection. See ”help par.region” for details. Default is to use the full image.
	allowed:	any
	Default:	variant
mask	Mask to use. See help par.mask. Default is none.
	allowed:	any
	Default:	variant
dropdeg	Drop degenerate axes
	allowed:	bool
	Default:	false
overwrite	Overwrite (unprompted) pre-existing output file?
	allowed:	bool
	Default:	false

Returns
image

Example

"""
#
print "\t----\t newimagefromimage Ex 1 \t----"
ia.maketestimage(’test1’,overwrite=true)
ia.maketestimage(’test2’,overwrite=true)
print ia.name()
#[...]test2
im1=ia.newimagefromimage(’test1’)
print im1.name()
#[...]test1
print im1.summary()
im2=ia.newimagefromimage(’test2’)
print im2.name()
#[...]test2
print im1.name()
#[...]test1
ia.close()
im1.done()
im2.done()
#
"""

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