Binary data in png file

[dedef]

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:

• 8.68 is the version of exiftool
• greenpuzzle.png is the name of the file
• E:/Temp/vert is the path of the folder
• 21660 is the size of the file
• 2014:01:27 22:29:28+01:00 is the FileModifyDate
• 666 is   
• 700700 are the ImageWidth and ImageHeight
• 23000       Ð  Ð 0 is   
• 37793779 are the PixelsPerUnitX and PixelsPerUnitY
• 1 is   
• 2013:11:07 23:00:32 is the ModifyDate 

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

Thanks

[Phil Harvey]

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

[dedef]

By this way, I get : ÿÿÿÿÿÿ Ñ  Ñ
Is it Unicode?
What does it mean please?

[Phil Harvey]

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

[dedef]

It is a puzzle (geocaching). Something is hiding in the picture, perhaps in the data ...

[Phil Harvey]

Ah,  Then I suggest this:

exiftool -v3 image.png

- Phil