This function tried to determine whether an object is an image that the
package knows how to handle. If its class is
"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
FALSE. Otherwise the value of the
An R object.
The value to return if the function can't tell whether or not
Jon Clayden <email@example.com>