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December 1998
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1998.12.16 07:38 "Re: TIFF to GIF conversion utility", by Niclas Borlin
>>>>> "Chris" == Chris VanHoose <Chris_VanHoose@accusearchinc.com> writes: Chris> I realize that this is not the exactly the correct place to Chris> post this message, but here I go. Chris> I am looking for a UNIX utility that can convert TIFF -G4 Chris> compression images to GIF images and resize the GIF image to Chris> 65% of it's original size. The utility I'm looking for must Chris> be able to do such a conversion in 3 seconds or less. I tried Chris> ImageMagick, which uses the TIFF library, but it was extremely Chris> slow. If you know of any good TIFF to GIF converters for Unix Chris> could you please let me know. Hi Chris, I did some test runs on my Sun UltraSparc II (Dual 200MHz) with the PBMPLUS package. You have the timings below for an A4-sized test image. The timings are not as good as you would like, but perhaps you could modify the source (for avaliability, see e.g. www.cica.indiana.edu/cica/faq/image_convert/convert.pbmplus.html) to speed things up... I believe a lot of time is spent shuffling data, since the source file is 11k, the resulting .gif file 73k, but the intermediate ppm file is 9M! A program that would read/scale/write strip-by-strip would most centainly be faster... Good luck! /Niclas No scaling: pixel% date; tifftopnm test.tif | ppmtogif -map map.ppm >! test.gif; date Wed Dec 16 08:13:48 MET 1998 tifftopnm: writing PBM file ppmtogif: computing other colormap... ppmtogif: 256 colors found Wed Dec 16 08:13:55 MET 1998 With scaling: pixel% date; tifftopnm test.tif | pnmscale 0.65 | ppmtogif -map map.ppm > ! test.gif; date Wed Dec 16 08:14:25 MET 1998 tifftopnm: writing PBM file ppmtogif: computing other colormap... pnmscale: promoting from PBM to PGM ppmtogif: 256 colors found Wed Dec 16 08:14:41 MET 1998 -- Niclas Borlin email: Niclas.Borlin@cs.umu.se Department of Computing Science phone: (+46) 90-786 68 32 Umea University fax: (+46) 90-786 61 26 S-901 87 Umea, SWEDEN lat/long: 63.49 N, 20.19 E -- To study a subject best, understand it thoroughly before you start.