Path: utzoo!utgpu!water!watmath!clyde!att!ucbvax!ucsd!net1!hutch
From: hutch@net1.ucsd.edu (Jim Hutchison)
Newsgroups: comp.graphics
Subject: Re: Floyd-Steinberg, yet again
Message-ID: <1051@ucsd.EDU>
Date: 23 Jul 88 17:58:08 GMT
References: <6506@well.UUCP> <1050@ucsd.EDU>
Sender: nobody@ucsd.EDU
Reply-To: hutch@net1.UUCP (Jim Hutchison)
Organization: UCSD EMU Project (Educational Microcomputer Unix)
Lines: 15

In article <1050@ucsd.EDU> hutch@net1.UUCP (Jim Hutchison) writes:
<               * ->  7/16
>            /  |
<        3/16 5/16
>
<        carry[x+1] += (7 * err) / 16         One ahead
>        if (x == 0)
<                carry[x] = err / 2           No back, 3+5/16 = 1/2
>        else
<                carry[x] = (5 * err) / 16    Propagate error down
TYPO------>      carry[x-1] = (3 * err) / 16  Propagate error diag back
Should Be--->    carry[x-1] += (3 * err) / 16

/*    Jim Hutchison   		UUCP:	{dcdwest,ucbvax}!cs!net1!hutch
		    		ARPA:	JHutchison@ucsd.edu		*/