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July 2007
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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 _____________________________ 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 _______________________________________________ Tiff mailing list: Tiff@lists.maptools.org http://lists.maptools.org/mailman/listinfo/tiff http://www.remotesensing.org/libtiff/