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

[Archive]

[Originally posted by ravi on 2006-11-06 17:21:37-08]

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

Code:

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

Code:

   - 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

Code:

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'
Custom        65016 Ascii     2  0x54000000 ''

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.

Code:

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

[Archive]

[Originally posted by exiftool on 2006-11-06 17:35:09-08]

Hi Ravi,

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

Code:

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

[Archive]

[Originally posted by exiftool on 2006-11-06 17:47:48-08]

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:

Code:

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

[Archive]

[Originally posted by ravi on 2006-11-06 19:25:01-08]

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

[Archive]

[Originally posted by exiftool on 2006-11-06 19:55:26-08]

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