***********************************************
		*                                             *
		*  About Odd Image Types, Sizes, and Headers  *
		*                                             *
		***********************************************



*****************
*               *
*  Header size  *
*               *
*****************

	May be any size, although the program is not equipped to
	handle images larger than 1024 in either dimension.
	A blank field is treated as 0 header bytes.
	If specified, field must contain non-negative decimal digits.

****************
*              *
*  Image Type  *
*              *
****************

	Currently supported:		byte, short integer.

	Currently not supported:	long integer, float, double.

*************
*           *
*  Columns  *
*           *
*************

	Field must be non-blank and contain non-negative decimal digits.
	Nuumber must be > 0.

**********
*        *
*  Rows  *
*        *
**********

	Field must be non-blank and contain non-negative decimal digits.
	Nuumber must be > 0.

*****************
*               *
*  Bytes/Pixel  *
*               *
*****************

	Field must be non-blank and contain non-negative decimal digits.
	Nuumber must be > 0.



****************
*              *
*  Image Size  *
*              *
****************


	Specified image size is computed as

		header bytes + (columns * rows * bytes/pixel).


	This number is compared to the size of the image requested;
	if they match, the program proceeds; if not, a message is produced.