How to delelte a specific tag

[PsYcHoTiC_MaDmAn]

Hi, I've been attempting to remove a non-standard tag from a tiff file as it stops me from importing the image into R for some analysis I need to perform.

using the -validate and -v options

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  ExifToolVersion = 12.58
  FileName = test.tif
  Directory = [snip]
  FileSize = 4183146
  FileModifyDate = 1679588798.47259
  FileAccessDate = 1679591103.85383
  FileCreateDate = 1679588484.75865
  FilePermissions = 33206
  FileType = TIFF
  FileTypeExtension = TIF
  MIMEType = image/tiff
  ExifByteOrder = II
  + [IFD0 directory with 20 entries]
  | 0)  ImageWidth = 1360
  | 1)  ImageHeight = 1024
  | 2)  BitsPerSample = 8 8 8
  | 3)  Compression = 1
  | 4)  PhotometricInterpretation = 2
  | 5)  Make = Olympus
  | 6)  Model = DP71
  | 7)  StripOffsets = 628 261748 522868 783988 1045108 1306228 1567348 1828468 2089588[snip]
  | 8)  Orientation = 1
  | 9)  SamplesPerPixel = 3
  | 10) RowsPerStrip = 64
  | 11) StripByteCounts = 261120 261120 261120 261120 261120 261120 261120 261120 26112[snip]
  | 12) XResolution = 72 (72/1)
  | 13) YResolution = 72 (72/1)
  | 14) PlanarConfiguration = 1
  | 15) ResolutionUnit = 2
  | 16) ModifyDate = 2022:08:26 13:03:39
  | 17) Artist = Olympus
  | Warning = [minor] Non-standard IFD0 tag 0x8318 Exif_0x8318
  | 18) Exif_0x8318 = 4207738
  | 19) ExifOffset (SubDirectory) -->
  | + [ExifIFD directory with 11 entries]
  | | 0)  ExposureTime = 0.001659 (1659/1000000)
  | | 1)  ExifVersion = 0210
  | | 2)  CreateDate = 2022:08:26 13:03:39
  | | 3)  ApertureValue = 0.95 (19/20)
  | | 4)  SubjectDistance = 0.00018 (9/50000)
  | | 5)  MeteringMode = 3
  | | 6)  FlashpixVersion = 0100
  | | 7)  ColorSpace = 1
  | | 8)  ExifImageWidth = 1360
  | | 9)  ExifImageHeight = 1024
  | | 10) ExposureMode = 1
  Warning = ExifIFD tag 0xa402 ExposureMode requires ExifVersion 0220 or higher
  Warning = [minor] ExifIFD tag 0xa002 ExifImageWidth is not allowed in TIFF
  Warning = [minor] ExifIFD tag 0xa003 ExifImageHeight is not allowed in TIFF
  Validate = 0 4 3
Validate                        : 4 Warnings (3 minor)
(I removed the file directory, but otherwise this is as it comes out)

I attempted to remove it with the following

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-Exif_0x8318-= -v
Warning: Tag 'Exif_0x8318' is not defined
Nothing to do.
any advice on how to remove this non-standard tag so I can carry on with the rest of my image processing would be greatly appreciated.

[edit]also tried -exif:0x8318 with same response

[Phil Harvey]

You need to create a user-defined tag to be able to write/delete any non-standard tag.  See NewEXIFTag in the sample config file for an example of how to do this.

- Phil

[PsYcHoTiC_MaDmAn]

Thanks Phil, it worked perfectly.