tag not ignored by ignore-tags

[ghosttie]

Magick.NET version

Magick.NET-Q8-AnyCPU 14.6.0

Environment (Operating system, version and so on)

Windows 10

Description

When I try to load a TIF using return new MagickImageCollection(stream); I get the exception

ImageMagick.MagickCoderErrorException
  HResult=0x80131500
  Message=Defined set_field_type of custom tag 3 (Tag 3) is TIFF_SETGET_UNDEFINED and thus tag is not read from file. `TIFFFetchNormalTag' @ error/tiff.c/TIFFErrors/574
  Source=Magick.NET-Q8-AnyCPU
  StackTrace:
   at ImageMagick.MagickImageCollection.NativeMagickImageCollection.ReadStream(IMagickSettings`1 settings, ReadWriteStreamDelegate reader, SeekStreamDelegate seeker, TellStreamDelegate teller, Void* data)
   at ImageMagick.MagickImageCollection.NativeMagickImageCollection.ReadStream(IMagickSettings`1 settings, ReadWriteStreamDelegate reader, SeekStreamDelegate seeker, TellStreamDelegate teller)
   at ImageMagick.MagickImageCollection.AddImages(Stream stream, IMagickReadSettings`1 readSettings, Boolean ping)
   at ImageMagick.MagickImageCollection.Read(Stream stream, IMagickReadSettings`1 readSettings)
   at ImageMagick.MagickImageCollection.Read(Stream stream)
   at ImageMagick.MagickImageCollection..ctor(Stream stream)

Steps to Reproduce

The image opens in other applications, so I assume Magick.NET is more strict about unknown tags. I tried to tell it to ignore the tag like this:

var readSettings = new MagickReadSettings {
	Format = MagickFormat.Tiff
};
readSettings.SetDefine(MagickFormat.Tif, "ignore-tags", "3,2,8");

return new MagickImageCollection(stream, readSettings);

but I get the same exception. I also tried this

var readSettings = new MagickReadSettings {
	Format = MagickFormat.Tiff,
	Defines = new TiffReadDefines {
		IgnoreTags = ["3", "2", "8"]
	}
};

return new MagickImageCollection(stream, readSettings);

but I still get the same exception. I also tried

var c = new MagickImageCollection();
c.AddRange(stream, readSettings);

instead of passing the stream to the MagickImageCollection constructor but it didn't make any difference.

Images

I can't upload the problem TIF because it contains confidential data

[dlemstra]

It might be an issue where you specify the wrong tag but it could also be an issue in the libtiff library. But I cannot help you without that file. Please respond here if you figure out what caused this,.

[ghosttie]

I used tiffinfo to get a list of all the unknown tags in the file and added them to ignore-tags and now I get a different error, so maybe when the exception said Defined set_field_type of custom tag 3 (Tag 3) it wasn't tag 3 but a tag starting with a 3? Because several of the unknown tags start with 3...

The exception I get now is

ImageMagick.MagickCoderErrorException
  HResult=0x80131500
  Message=Corrupt SOS marker in JPEG data. `OJPEGReadHeaderInfoSecStreamSos' @ error/tiff.c/TIFFErrors/574
  Source=Magick.NET-Q8-AnyCPU
  StackTrace:
   at ImageMagick.MagickImageCollection.NativeMagickImageCollection.ReadStream(IMagickSettings`1 settings, ReadWriteStreamDelegate reader, SeekStreamDelegate seeker, TellStreamDelegate teller, Void* data)
   at ImageMagick.MagickImageCollection.NativeMagickImageCollection.ReadStream(IMagickSettings`1 settings, ReadWriteStreamDelegate reader, SeekStreamDelegate seeker, TellStreamDelegate teller)
   at ImageMagick.MagickImageCollection.AddImages(Stream stream, IMagickReadSettings`1 readSettings, Boolean ping)
   at ImageMagick.MagickImageCollection.Read(Stream stream, IMagickReadSettings`1 readSettings)
   at ImageMagick.MagickImageCollection..ctor(Stream stream, IMagickReadSettings`1 readSettings)

[dlemstra]

It looks like you have a tiff file with corrupt data and ignoring the tags that are corrupt is not sufficient in your case.