the header and the trailer of an image; the body lines are inflated but not parsed. An image
given whole is read from its two ends, whatever its size: the header is its first line, the
trailer its last non-empty one, and the node lines are counted, not read
the header and the trailer of an image; the body lines are inflated but not parsed. An image given whole is read from its two ends, whatever its size: the header is its first line, the trailer its last non-empty one, and the node lines are counted, not read