How to add metadata to png file?

eyemeansit · 07-27-2007, 02:16 PM

Hiya!

I have created a series of 50 .png images for use as a slideshow or screensaver. I would like to add image credits, authorship data, comments,etc. to each file, (as metadata, not as part of the image itself) but can't figure out how to do this. The .png's are artwork that I created in Blender/Gimp/Xara, and thus have no exif info such as what a camera would provide. Any ideas on how to do this?

Thanks!

Les

macemoneta · 07-27-2007, 03:13 PM

The ImageMagick graphics tools (included with most distributions) contain the tools to do this. For example:

Code:

mogrify -comment "test" /somedir/somephoto.png

The above will add the comment "test" to the file, which you can display with:

Code:

identify -verbose  /somedir/somephoto.png | grep "Comment:"

For example to add a comment to all .png files in the current directory:

Code:

for file in *.png ; do mogrify -comment "test" "$file" ; done

For more information on what you can change:

Code:

mogrify | less

eyemeansit · 07-27-2007, 09:19 PM

...any other (GUI)ideas? ImageMagick is way beyond me, sorry!

eyemeansit · 01-15-2008, 01:43 PM

I managed to accomplish this with Digikam's KIPI tools... but only after converting the .png's to .jpegs. Apparently the .png format is lacking in standardization as to how it handles metadata, and therefore the lack in standard gui tools?