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July 2007
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2007.07.04 18:52 "Re: BigTIFF extension", by Toby Thain
On 4-Jul-07, at 3:25 PM, Phil Harvey wrote: > Hi Andrew, > > On 4-Jul-07, at 2:02 PM, Andrew wrote: >> I would hope that the design of BigTIFF means that the messages >> are not simply "Cannot open. File is corrupt", but rather >> something like "file uses an unsupported compression algorithm". > > As an example, ExifTool 6.92 will print the following error message > when presented with a BigTIFF image: "Bad IFD0 directory". > > This is because there are (unfortunately) TIFF-like files out there > that use ID words other the standard TIFF 0x002a (42 decimal), so > ExifTool can't veto a TIFF image based only on the TIFF ID word. > > However, most tools will complain about the invalid ID, so with > most tools I would expect an error more like "Not a valid TIFF > image", or "Unknown image format". Which is going to cause mucho confusion when a user is trying to open SOMETHING.TIF with a tool they expect can process TIFF (which they know is implied by .TIF). --Toby > > - Phil > > > > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/