Re: [Libexif-devel] Please report this tag ...

[Dan F. <da...@co...>]

On Mon, Sep 09, 2013 at 10:38:30AM +0200, Mathieu Malaterre wrote:
>   I am getting the following report:
> 
> ExifData: Unknown tag 0xa401 (entry 14 in '0'). Please report this tag
> to <lib...@li...>.
> ExifData: Unknown tag 0xa402 (entry 15 in '0'). Please report this tag
> to <lib...@li...>.
> ExifData: Unknown tag 0xa403 (entry 16 in '0'). Please report this tag
> to <lib...@li...>.
> ExifData: Unknown tag 0xa404 (entry 17 in '0'). Please report this tag
> to <lib...@li...>.
> ExifData: Unknown tag 0xa406 (entry 18 in '0'). Please report this tag
> to <lib...@li...>.
> ExifData: Unknown tag 0xa40c (entry 19 in '0'). Please report this tag
> to <lib...@li...>.

These tags are not allowed to exist in IFD 0, only the EXIF IFD. That means
that technically, the file is corrupt.

>   However this particular JPG contains private data. How can I remove
> the jpg file, and only share the exif data ?

You can do that easily enough using libexif, but the exif command-line tool
doesn't expose that functionality. You can of course just run
"exif file.jpg" and "exif --show-mnote file.jpg" to display the EXIF tags
in text format, but if you want the raw EXIF data without writing any code
to get it, you'll have to use another program.

>>> Dan