image_size: Insert HEIGHT and WIDTH parameters into HTML <IMG ...> tags.

Usage: image_size [<options>] [<file> ...]

Options:
	-d		Debug messages
	-O		overwrite input file
	-r <dir>	local directory <root> corresponding to "/" in HREF
	-i		file is not HTML but an image.

Notes:
	Default output is to STDOUT.

	No <file> on cmd line means use STDIN.

	More than one file on cmd line means to merge the HTML from all of them.
	(however, if -O is specified each file is overwritten individually)

	If an <IMG ...> tag already has HEIGHT WIDTH parameters,
	they are corrected, otherwise they are inserted.
	
	This program depends on file(1), djpeg(1), and convert(1) output.
	Tested on Redhat Linux, it may work elsewhere...

	Currently handles gif, jpeg, and png images.