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August 2005
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2005.08.04 15:08 "Re: tiff unknown field of tag", by Frank Warmerdam
On 8/4/05, Steven Woody <narkewoody@gmail.com> wrote: > > i got back some scaned tiff's from a photo lab. openning with xv or gimp > just got a warning message: unkown field of tag 34665(0x8769). i want to > know what's wrong with thoese files and how do a work around. Steve, Note, this is a warning not an error. It doesn't mean there is anything wrong with the file, just that there is stuff in the file that isn't recognised by libtiff as baseline tags. > below is the output of tiffinfo on a tiff file in question, > > ,---- > | TIFFReadDirectory: Warning, /home/portfolio/scan/zmm/16-4.tif: unknown > field with tag 34665 (0x8769) encountered. > | TIFF Directory at offset 0x8 > | Subfile Type: (0 = 0x0) > | Image Width: 1580 Image Length: 2338 > | Resolution: 1800, 1800 pixels/inch > | Bits/Sample: 8 > | Compression Scheme: None > | Photometric Interpretation: RGB color > | Date & Time: "2005:08:04 19:54:07" > | Samples/Pixel: 3 > | Rows/Strip: 2338 > | Planar Configuration: single image plane > | ICC Profile: <present>, 668992 bytes > | Photoshop Data: <present>, 5624 bytes > | XMLPacket (XMP Metadata): > | ... > `---- Well, it looks like you have trimmed the output at the interesting point. In particular, modern tiffinfo's attempt to report some basic information about unrecognised tags at the end of known tag processing. > 1. what means "ICC Profile: <present>" ? and what is ICC ? It is information related to color control. Do you really want to know more? > 2. i noticed this file is uncompressed. so what's the benefit the lab save > result in tiff rather than a bmp? Because a variety of extra metadata can be saved in it. Why would saving it in BMP be better than saving it in TIFF? Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent