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July 2007

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2007.07.12 15:21 "how to rotate an image", by Oliver Geisen
2007.07.12 15:30 "Re: how to rotate an image", by Andy Cave
2007.07.14 12:45 "Re: how to rotate an image", by Oliver Geisen
2007.07.14 13:47 "Re: how to rotate an image", by Andy Cave

2007.07.12 15:30 "Re: how to rotate an image", by Andy Cave

Hi Oliver,

How large are the images you're rotating? Our pre-press product FirstPROOF 
has the ability to rotate 1-bit images, by 90, 180 or 270 degrees, very 
fast, however big they are, whether they are striped or tiled. I can tell 
you that writing such code to be efficient for any sized images (and leaving 
a resulting image that is sequentially accessed on disk for subsequent 
maximum i/o performance) is not a trivial task. If you're not an experienced 
s/w engineer, I would suggest you hire one.

Regards,

Andy.

Andy Cave,
Chief Executive Officer,
Hamillroad Software Limited.
www.firstproof.com
www.hamillroad.com

----- Original Message ----- 
From: "Oliver Geisen" <oliver.geisen@kreisbote.de>
To: <tiff@lists.maptools.org>
Sent: Thursday, July 12, 2007 4:21 PM
Subject: [Tiff] how to rotate an image


Hello,

how can i rotate an tiff image by 180 degrees (from head-up to head-
down) ?
For now i use Strip-reading bottom-up and scanline writing top-down.
The problem is that i also have to swob all bits of each scanline
horizontaly (byte and bit swob) and don't know how to handle this
effectivly.
Any ideas about that ?


Oliver Geisen
Systemadministrator
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Kreisboten Verlag Mühlfellner KG
82362 Weilheim i. Ob.
Tel. 0881/686-904
Fax 0881/686-74
Sitz Weilheim, AG München, HRA 64016, p.h.G.:
Kreisboten-Verlag Verwaltungsgesellschaft mbH,
Weilheim, AG München, HRB 119773,
Geschäftsführer: Dr. Dirk Ippen, Dr. Gerd Waldenmaier




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