1.1.1.0 image.ispersistent

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image.ispersistent - Function

1.1.1 Is the image persistent?

Description

This function can be used to find out whether the image is persistent on disk or not. There is a subtle difference from the image being virtual. For example, a virtual image which references another which is on disk is termed persistent.

Arguments

Returns
bool

Example

"""
#
print "\t----\t ispersistent Ex 1 \t----"
ia.fromshape(outfile=’tmp’, shape=[10,20], overwrite=true)
print ia.ispersistent()
#True
ia.close()
ia.fromimage(infile=’tmp’)
print ia.ispersistent()
#True
im3 = ia.subimage()
print im3.ispersistent() # Persistent virtual image !
#True
im4 = ia.imagecalc(pixels=’tmp+tmp’)
print im4.ispersistent()
#False
im3.done()
im4.done()
ia.close(remove=true)
#
"""

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