Feature #464

Support PNG images

Added by Andreas Huggel almost 13 years ago. Updated about 10 years ago.

Status:ClosedStart date:
Priority:NormalDue date:
Assignee:Gilles Caulier% Done:


Target version:0.18


Needs a new PngImage class to parse (decode and encode) metadata from/into PNG images. Among the metadata types that can be stored in PNG images are Exif, IPTC and XMP.

Additional information:

From Gilles Caulier:

If you is interressed to make a simple PNG parser in Exiv2 (My dream (:=))),
just take a look in KDE API (KFileMetaInfo class). This is a simple class to
extract metadata (not too powerfull than Exiv2) from image/audio/video file.

About PNG KFileMetaInfo use a plugin to parse in read only PNG file. The code
is simple and do not use libPNG :


If you want some help to clarify Qt/KDElib API, let's me hear...

About Raw profile embedded into PNG file by IM, take a look here :


look like IM can provide also XMP raw profile !!! For the future of Exiv2

From http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PNG.html#TextualData:

Metadata is stored in PNG TextualData format, which allows aribrary tag names to be used. The information for the TextualData tags may be stored as tEXt, zTXt or iTXt chunks in the PNG image.


#2 Updated by mikolaj - almost 11 years ago

Isn't it implemented?

#3 Updated by Andreas Huggel almost 11 years ago

~986: Only read support is available yet.

#4 Updated by Andreas Huggel over 10 years ago

Gilles added write support in

#5 Updated by Andreas Huggel about 10 years ago

  • % Done changed from 0 to 100

#6 Updated by Andreas Huggel about 10 years ago

  • Status changed from Resolved to Closed

Also available in: Atom PDF

Redmine Appliance - Powered by TurnKey Linux