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January 2008
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2008.01.22 23:59 "Re: Tiff Digest, Vol 44, Issue 8, Cropping faxes", by Andy Cave
Hi Richard, I don't think that tiffcrop will do what Erez wants - I think you mis-read his request. He doesn't really want to clip the 'input' image, but extract the first X rows from it and append the last X rows from it into a new image that is 2X high. You can do that with libtiff with a bit of programming - if all his images are 1 bit he can use the lower level APIs to extract each scanline one at a time and using a simple counter write the first X, ignore the next height-2X and write the final X to a new file. Regards, Andy. ----- Original Message ----- From: "Richard Nolde" <nrichard8@qwest.net> To: <tiff@lists.maptools.org> Sent: Tuesday, January 22, 2008 10:30 PM Subject: [Tiff] Re: Tiff Digest, Vol 44, Issue 8, Cropping faxes > 1. How to clip an image with LibTiff (Erez.Har-Tal@Walgreens.com) >> Tiffcrop was written to handle just this sort of thing. It is in the >> utilities section of recent releases and/or in CVS. Read the man page or >> type tiffcrop --help to see all the options. > Richard Nolde, tiffcrop author >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Mon, 21 Jan 2008 13:38:09 -0600 >> From: Erez.Har-Tal@Walgreens.com >> Subject: [Tiff] How to clip an image with LibTiff >> To: tiff@lists.maptools.org >> Message-ID: >> <OFFC203445.FE96EEE5-ON862573D7.006ADF71-862573D7.006BDDBF@walgreens.com> >> >> Content-Type: text/plain; charset=US-ASCII >> >> >> Hello everyone, >> >> Please excuse me if I am new to libtiff, so any help would be >> appreciated. >> >> We deal with faxes in standard mode (204X98 dpi) or fine mode (204X198 >> dpi) >> saved with compression of type G3 1D. >> >> I need to write a utility that clips the first X rows (pixel) from the >> top >> of the tiff image and last X rows from the bottom of the tiff image. We >> will save it to a new tiff image with G3 compression in the height of 2X >> pixels. The first X rows will be the top of the new image and the last X >> rows will be the bottom of the image. The operation to clip the image, >> should not alter the image nor do any thing that would damage the image. >> >> Is it doable using libtiff on Unix ? Any help and direction will be >> highly >> appreciated. Doable using other open source libraries ? >> >> Thanks, >> >> ==================== >> Erez Har-Tal >> Computer Telephony >> Execution Architecture and Telephony Solutions dept. >> > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/