Path: utzoo!attcan!uunet!husc6!mailrus!cornell!uw-beaver!ssc-vax!cxsea!blm
From: blm@cxsea.UUCP (Brian Matthews)
Newsgroups: comp.lang.postscript
Subject: Re: Help!  What am I doing wrong here?
Message-ID: <2566@cxsea.UUCP>
Date: 18 Nov 88 18:16:27 GMT
References: <4181@teklds.TEK.COM>
Reply-To: blm@cxsea.UUCP (Brian Matthews)
Organization: Computer X Inc.
Lines: 21

Tim Stoehr (tims@teklds.TEK.COM) writes:
|I'm having a problem with my first use of the 'image' operator.

|20 20 1 [20 0 0 20 0 0] { [data] } image

RTFM.  From page 74 of the Postcript Language Reference Manual (the red
book):

"If bits/sample is less than 8 and width is not a multiple of the number
of samples per character, there must be extra samples at the end of each
row to fill up the last character.  The values of the extra samples are
not used; they are present only in order to align the data so that each
row starts on a character boundary."

In your case, bit/samples (1) is less than 8, and the width (20) isn't a
multiple of the number of samples per character (8 / 1 = 8).  Pad each
line to 24 bits.

-- 
Brian L. Matthews  blm@cxsea.UUCP   ...{mnetor,uw-beaver!ssc-vax}!cxsea!blm
+1 206 251 6811    Computer X Inc. - a division of Motorola New Enterprises