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.TH DISN 1 "Ultrasonics Laboratory"
.SH NAME
disn - Quantize an N x N picture
.SH SYNOPSIS
disn [if=file] [n=N] [-r] [min max]
.SH DESCRIPTION
This program quantizes an N x N single precision floating point picture
into eight bit bytes suitable for displaying
on either the Grinnel or the Comtal.
The resulting picture is placed into the file
.B pic.
Normally the picture is quantized so that the smallest
value in the picture is displayed as black and the highest
as white.  
All other values fall linearly between.   
This can be changed by listing the desired minimum and
maximum.
.PP
The option are:
.TP 13
if=file
is the input file for the picture.
The file should be organized as an N x N array 
of single precision floating point numbers.
The default input file is 
.B pic.r.
.TP
n=N
specifies the size of the picture.
Both the input and the output files will be the same size.
.TP
-r
reverses the sense of the picture.
After quantizing
each byte of the picture is subtracted from 255.
.TP
[min max]
correspond to black and white in the final picture.
All pixels that are below the minimum are set to black
and all pixels above the maximum are set to white.
.SH FILES
.TP 13
pic.r
is the default input file.
.TP
pic
is the output file.
.SH DIAGNOSTICS
An error message is output if either the input
or the output files can't be opened.
.SH BUGS
Can't send output to an arbitrary file.