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From: jef@well.sf.ca.us (Jef Poskanzer)
Newsgroups: alt.graphics.pixutils,comp.graphics
Subject: Re: how to give pnmrotate a negative angle?
Message-ID: <23024@well.sf.ca.us>
Date: 6 Feb 91 19:27:39 GMT
References: <865@keele.keele.ac.uk>
Reply-To: Jef Poskanzer <jef@well.sf.ca.us>
Organization: Paratheo-Anametamystikhood Of Eris Esoteric, Ada Lovelace Cabal
Lines: 15

In the referenced message, cca13@seq1.keele.ac.uk (G.D. Pratt) wrote:
}Can anyone tell me how to tell the pnmrotate command, in the new
}beta release of PBMPLUS, how to rotate the image by a negative angle
}since it appears to take the "-" as the flag symbol

Yes, that's a bug, introduced when I added the -noantialias flag.
pnmshear has the same problem.  Until the next patch comes out you
can work around it using pnmflip.  For example, to do a -20 rotate,
you could instead do pnmflip -lr | pnmrotate 20 | pnmflip -lr.
---
Jef

  Jef Poskanzer  jef@well.sf.ca.us  {apple, ucbvax, hplabs}!well!jef
 "If you give me six lines written by the most honest man, I will find
       something in them to hang him." -- Cardinal de Richelieu