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2008.01.22 20:39 "Re: How to clip an image with LibTiff", by Andrey Kiselev
On Mon, Jan 21, 2008 at 01:38:09PM -0600, Erez.Har-Tal@Walgreens.com wrote: > 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 ? That is pretty doable with libtiff. Moreover, there is a ready to use utility called tiffcrop capable to perform various geometry transformations. But it can't do stretching though. What kind of input image do you have? Is it a raw fax or TIFF? If it is a raw file you can use fax2tiff utility to do stretching and conversion to TIFF and tiffcrop on resulting file. Both fax2tiff and tiffcrop are part of libtiff distribution. http://remotesensing.org/libtiff/man/fax2tiff.1.html http://remotesensing.org/libtiff/man/tiffcrop.1.html Best regards, Andrey -- Andrey V. Kiselev ICQ# 26871517