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In a previous comment, ideasman42 explains : stamp options are written into metadata of EXR/JPEG/PNG files.

But I can't find any EXIF information in JPG and PNG files generated by Blender (version 2.78).

Enabling Meta Data in the Render tab does not change anything...

Edit :

After some investigations, I realized that stamp informations are stored in the image file as JPEG markers and not in EXIF format...

Metadata can be displayed with a JPEG utility like jpeginfo :

$ jpeginfo -C untitled.jpg 
untitled.jpg  960 x 540  24bit JFIF  N   13028 
"Blender:File:<untitled>"  "Blender:Note:dominique Parisot"
"Blender:Date:2017/08/17 19:46:52" "Blender:Time:00:00:00:01"
"Blender:Frame:001" "Blender:Camera:Camera" "Blender:Scene:Scene"
"Blender:RenderTime:00:00.05"

But they can not be found with an EXIF utility like exiv2 : 

$ exiv2 untitled.jpg 
File name       : untitled.jpg
File size       : 13028 Bytes
MIME type       : image/jpeg
Image size      : 960 x 540
untitled.jpg: No Exif data found in the file
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  • $\begingroup$ Does this help? blender.stackexchange.com/questions/2651/… $\endgroup$
    – Ray Mairlot
    Commented Aug 1, 2017 at 17:56
  • $\begingroup$ @RayMairlot : thank you for your response. I used exiv2 to verify that blender output files do not contain any EXIF information : $ exiv2 untitled.jpg File name : untitled.jpg File size : 20692 Bytes MIME type : image/jpeg Image size : 960 x 540 untitled.jpg: No Exif data found in the file $\endgroup$
    – Dominique Parisot
    Commented Aug 1, 2017 at 18:04
  • 1
    $\begingroup$ If you have additional information to add to your question please use the edit link below it instead of comments. $\endgroup$
    – Ray Mairlot
    Commented Aug 17, 2017 at 21:42

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