Re: EXIF support in PNG

Glenn Randers-Pehrson <[email protected]>
Newsgroups gmane.comp.graphics.png.general
Message-ID <CA+PdXctaae54fFP9bkhXAhAf5jSoRY1KpL17q9R5q5c04yoDVQ@mail.gmail.com>
I added a Security Considerations section to the eXIf proposal:

  Exif Security considerations

   It is proposed to add the following two clauses to Section 7 (Security
   Considerations) of the "Extensions to the PNG 1.2 Specification,
   Version 1.4.0" document:

   The eXIf chunk may contain data such as image resolution and dimensions
   that are redundant with existing PNG chunks. Applications must be
   prepared to handle such redundant and perhaps conflicting information.

   The eXIf chunk may contain a "thumbnail" or a "preview" of the image.
   If the image has been redacted or otherwise edited, authors may be
   surprised to learn that they have leaked private information by
   publishing an unredacted image.

Glenn

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