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png - PNG querying and manipulation of meta data

Table Of Contents


package require Tcl 8.5 9
package require crc32
package require png ?0.4?

::png::validate file
::png::isPNG file
::png::imageInfo file
::png::getTimestamp file
::png::setTimestamp file time
::png::getComments file
::png::removeComments file
::png::addComment file keyword text
::png::addComment file keyword lang keyword2 text
::png::getPixelDimension file
::png::image file
::png::write file data


This package provides commands to query and modify PNG images. PNG stands for Portable Network Graphics and is specified at


Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category png of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.


comment, image, png, timestamp


File formats


Copyright © 2004, Code: Aaron Faupell
Copyright © 2004, Doc: Andreas Kupries