"nifti"
,
"niftiImage"
, "internalImage"
or "MriImage"
, then the
result is always TRUE
. Likewise if it has an internal image pointer.
If it has no dim
attribute, or looks like an affine matrix, then the
result is FALSE
. Otherwise the value of the unsure
argument
is returned.
isImage(object, unsure = NA)
object
is an image.