ExifTool Forum

ExifTool => Newbies => Topic started by: dedef on January 27, 2014, 06:01:31 PM

Title: Binary data in png file
Post by: dedef on January 27, 2014, 06:01:31 PM
Hello,

Using exiftoolgui with a png file, I get:
palette : (Binary data 12 bytes, use -b option to extract).

So I use the command exiftool -b and I get:
8.68greenpuzzle.pngE:/Temp/vert216602014:01:27 22:29:28+01:00666PNGimage/png7007
0023000       Ð  Ð 03779377912013:11:07 23:00:32700x700

Where:

Is it possible that some of this information has been injected? How?

Thanks
Title: Re: Binary data in png file
Post by: Phil Harvey on January 27, 2014, 07:26:57 PM
Hi Thomas,

Normally one wouldn't use -b to extract everything.  If you want the Palette, do this:

exiftool -b -palette test.png > palette.dat

- Phil
Title: Re: Binary data in png file
Post by: dedef on January 28, 2014, 02:41:17 AM
By this way, I get : ÿÿÿÿÿÿ Ñ  Ñ
Is it Unicode?
What does it mean please?
Title: Re: Binary data in png file
Post by: Phil Harvey on January 28, 2014, 07:12:30 AM
The palette file will be binary data.  If you don't know what it is, then you probably don't want to extract it.

- Phil
Title: Re: Binary data in png file
Post by: dedef on January 28, 2014, 07:40:42 AM
It is a puzzle (geocaching). Something is hiding in the picture, perhaps in the data ...
Title: Re: Binary data in png file
Post by: Phil Harvey on January 28, 2014, 07:47:33 AM
Ah,  Then I suggest this:

exiftool -v3 image.png

- Phil