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July 2008
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2008.07.24 19:19 "Re: Converting from Jpeg compressed Tiff", by Chris Cox
Photoshop uses the newer (technote 1) JPEG encoding. And those files should be compatible (we test with libTIFF quite a bit, but Iım never sure which build they pick up). Chris On 7/24/08 8:45 AM, "Argo Abramian" <Argo.Abramian@brandwizard.com> wrote: > Thanks for replies. Jpeg compressed tiff file was created by saving no > compression tiff file with jpeg compression option in Photoshop CS3. It gave a > warning: "This compression is not supported in older TIFF readers. Use > compression?" I am new to this so I donıt know what kind of Jpeg encoding CS3 > is using. Previews for other tiff files I was able to generate with > ImageMagick but it fails with Jpeg compressed tiff files. Someone suggested > using LibTiff for this so I downloaded tiff-3.8.2 from > ftp://ftp.remotesensing.org/pub/libtiff/ But he was no tiff2jpeg so I tried > tiff2pdf but it gave me output files that did not look good (with large > horizontal bars) the only time it output more or less correct jpeg when I used > it with ³n² option but the output file was too small in pixels but 4 times > bigger in file size. > Basically I am just asking for advice: what would you suggest to use to > generate preview from this kind of tiff file: > http://209.208.230.141/bwt/Bad_700K_RGB_JPG.tif > Thank you very much. > > > > From: tiff-bounces@lists.maptools.org [mailto:tiff-bounces@lists.maptools.org] > On Behalf Of Chris Cox > Sent: Wednesday, July 23, 2008 7:23 PM > To: Argo Abramian; TIFF > Subject: Re: [Tiff] Converting from Jpeg compressed Tiff > > Well, are they old-JPEG (TIFF 6 spec, buggy) or new JPEG (technote 1) encoded > in the TIFF files? > Where did the failing images come from? > What version of LibTIFF are you using? > Did you compile it with JPEG (old or new) support? > > Chris > > > > On 7/23/08 4:05 PM, "Argo Abramian" <Argo.Abramian@brandwizard.com> wrote: > Hi, in my asp.net web application I need to be able to generate jpegs and gifs > from tiff files. No compression or LZW or ZIP compressed files I can process > using various programs but all of them fail when dealing with JPEG compressed > tiff files. Any help would be greatly appreciated. Thanks > > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/ > >