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Version 1.9 Build 1488

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image.ispersistent - Function

	Package	general
	Module	images
	Tool	image

Is the image persistent ?

Synopsis
ispersistent()

Returns
Bool or fail

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.

Example

- im := imagefromshape(outfile='tmp', shape=[10,20])
- im.ispersistent()
T
- im2 := imagefromimage(infile='tmp', region=drm.box())
- im2.ispersistent()
F
- im3 := im2.subimage()
- im3.ispersistent()                  # Persistent virtual image !
T
- im4 := imagecalc(pixels='tmp+tmp2')
- im4.ispersistent()
F