cannot view the tiff tag name when adding in unix and viewing it in windows

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Posted on Mon Nov 6 19:21:37 2006 by ravi

cannot view the tiff tag name when adding in unix and viewing it in windows

hi I am using the following code to write the tif tag

perl exiftool.pl -Image_Modified=T mymerge.tif Name "Image::ExifTool::RELEASE" used only once: possible typo at exiftool.pl line 161. 1 image files updated

and when i view the tag by issuing the following command
perl exiftool.pl -u -D mymerge.tif. I get the following infomation

- ExifTool Version Number : 6.42 - File Name : mymerge.tif - File Size : 560 kB - File Modification Date/Time : 2006:11:06 11:12:43 - File Type : TIFF - MIME Type : image/tiff 256 Image Width : 416 257 Image Height : 300 258 Bits Per Sample : 8 8 8 259 Compression : Uncompressed 262 Photometric Interpretation : RGB 274 Orientation : Horizontal (normal) 277 Samples Per Pixel : 3 278 Rows Per Strip : 6 282 X Resolution : 100 283 Y Resolution : 100 284 Planar Configuration : Chunky 296 Resolution Unit : inches 65016 Image Modified : T 273 Strip Offsets : (Binary data 159 bytes, use -b option to extract) 279 Strip Byte Counts : (Binary data 124 bytes, use -b option to extract) 305 Software : IrfanView - Image Size : 416x300

Please note the tag 65016
I use the same file and view using my tiffdump.exe windows program and the result of that is as follows

mymerge.tif Motorola byte order IFD 1: Offset=0x8, Count=16 ImageWidth 256 Short 1 0 [0x1a00000] ImageLength 257 Short 1 0 [0x12c0000] BitsPerSample 258 Short 3 0xce Compression 259 Short 1 0 [0x10000] PhotoInter 262 Short 1 0 [0x20000] StripOffsets 273 Long 50 0xd4 Orientation 274 Short 1 0 [0x10000] SamplesPerPixel 277 Short 1 0 [0x30000] RowsPerStrip 278 Short 1 0 [0x60000] StripByteCounts 279 Long 50 0x19c XResolution 282 Rational 1 0x264 1677721600/16777216 YResolution 283 Rational 1 0x26c 1677721600/16777216 PlanarConf 284 Short 1 0 [0x10000] ResolutionUnit 296 Short 1 0 [0x20000] Software 305 Ascii 10 0x274 'IrfanView' <b>Custom 65016 Ascii 2 0x54000000 ''</b> IFD 2: Offset=0x27e, Count=15 ImageWidth 256 Short 1 0 [0xdc0000] ImageLength 257 Short 1 0 [0x12c0000] BitsPerSample 258 Short 3 0x338 Compression 259 Short 1 0 [0x10000] PhotoInter 262 Short 1 0 [0x20000] StripOffsets 273 Long 25 0x33e Orientation 274 Short 1 0 [0x10000] SamplesPerPixel 277 Short 1 0 [0x30000] RowsPerStrip 278 Short 1 0 [0xc0000] StripByteCounts 279 Long 25 0x3a2 XResolution 282 Rational 1 0x406 1677721600/16777216 YResolution 283 Rational 1 0x40e 1677721600/16777216 PlanarConf 284 Short 1 0 [0x10000] ResolutionUnit 296 Short 1 0 [0x20000] Software 305 Ascii 10 0x416 'IrfanView' 1 Images, 0 Errors

Please notice the tag 65016 and you will not see the T which was supposed to be in there. I would like to mention that this tif file is a merged file of two images.
When I just add the tif tag for an image which is not merged it works fine.
Also I noticed that If I add more than one character in the tag appears to be working. Could you please suggest if it is an issue with the tag data type. I am furnishing the details of the tags that appear when I add more than one character for the tag name.

mymerge4.tif Motorola byte order IFD 1: Offset=0x8, Count=16 ImageWidth 256 Short 1 0 [0x1a00000] ImageLength 257 Short 1 0 [0x12c0000] BitsPerSample 258 Short 3 0xce Compression 259 Short 1 0 [0x10000] PhotoInter 262 Short 1 0 [0x20000] StripOffsets 273 Long 50 0xd4 Orientation 274 Short 1 0 [0x10000] SamplesPerPixel 277 Short 1 0 [0x30000] RowsPerStrip 278 Short 1 0 [0x60000] StripByteCounts 279 Long 50 0x19c XResolution 282 Rational 1 0x264 1677721600/16777216 YResolution 283 Rational 1 0x26c 1677721600/16777216 PlanarConf 284 Short 1 0 [0x10000] ResolutionUnit 296 Short 1 0 [0x20000] Software 305 Ascii 10 0x274 'IrfanView' Custom 65016 Ascii 7 0x27e 'T34567' IFD 2: Offset=0x286, Count=15 ImageWidth 256 Short 1 0 [0xdc0000] ImageLength 257 Short 1 0 [0x12c0000] BitsPerSample 258 Short 3 0x340 Compression 259 Short 1 0 [0x10000] PhotoInter 262 Short 1 0 [0x20000] StripOffsets 273 Long 25 0x346 Orientation 274 Short 1 0 [0x10000] SamplesPerPixel 277 Short 1 0 [0x30000] RowsPerStrip 278 Short 1 0 [0xc0000] StripByteCounts 279 Long 25 0x3aa XResolution 282 Rational 1 0x40e 1677721600/16777216 YResolution 283 Rational 1 0x416 1677721600/16777216 PlanarConf 284 Short 1 0 [0x10000] ResolutionUnit 296 Short 1 0 [0x20000] Software 305 Ascii 10 0x41e 'IrfanView' 1 Images, 0 Errors

If you see the same tag it has the value in it.
I do not know what to infer from this any help is greatly appreciated
ravi

Direct Responses: 3423 | 3426 | Write a response

Posted on Mon Nov 6 19:35:09 2006 by exiftool in response to 3422

Re: cannot view the tiff tag name when adding in unix and viewing it in windows

Hi Ravi,

The issue is with your tiffdump.exe software. For some reason it is displaying a short custom ASCII string as hex:

Custom 65016 Ascii 2 0x54000000

Hex 0x54 is an ASCII "T". And you can see that it is "Ascii" format and 2 bytes long (the "T" followed by a null terminator), which is correct.

So it looks like the information is being written correctly, but just not displayed correctly by tiffdump.exe.

- Phil

Direct Responses: 3428 | Write a response

Posted on Mon Nov 6 19:47:48 2006 by exiftool in response to 3422

Re: cannot view the tiff tag name when adding in unix and viewing it in windows

Also, it looks like you are using a newer version of 'exiftool' with an older version of the ExifTool library, because you you shouldn't be getting the following warning if the library version is correct:

Name "Image::ExifTool::RELEASE" used only once: possible typo at exiftool.pl line 161.

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Posted on Mon Nov 6 21:25:01 2006 by ravi in response to 3423

Re: cannot view the tiff tag name when adding in unix and viewing it in windows

Thanks for your Immediate response. Yes I am using the newer version, I downloaded both the versions just to check my code. But I have just one more question, actually two. What datatypes are supported by exiftool and what is IDF0.. Your answer is highly appreciated as always
thanks
ravi

Direct Responses: 3429 | Write a response

Posted on Mon Nov 6 21:55:26 2006 by exiftool in response to 3428

Re: cannot view the tiff tag name when adding in unix and viewing it in windows

ExifTool supports all data types. But note that ExifTool even supports data types which can't be used in EXIF information. Read lib/Image/ExifTool/README for details -- it lists all types, and specifies which are used in EXIF information.

To understand what IFD0 is, you really should read the EXIF or TIFF spec. But basically, it is the section of a TIFF image where the main image is stored. Usually meta information related to the main image goes in either IFD0, or the ExifIFD. I would actually prefer putting custom tags in the ExifIFD personally, because then you are less likely to conflict with tags in IFD0 that affect the rendering of the image.

I hope this helps.

- Phil

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