On 09/13/2010 11:47 AM, jeremy jozwik wrote:
> hello list, just added my self so i hope this is an active list.
> im am attempting to batch compress OSM tile images. they are of png
> format, otherwise i would have used cjpeg.
> anyhow the script need only open the images in a folder and save them
> out with a different compression level [9]
<<< snip >>>


It seems to me that using Gimp for this task is perhaps not the best use of 
or of your time.  I do not know the specific answer to your question about the 
problem you are encountering, but perhaps a program such as ImageMagick


would be more suitable.  ImageMagick is specifically designed to do the kind of 
batch tasks that I believe I understand you wish to accomplish.  We use it to 
process tens of thousands of images (making multiple sizes of JPEGs from 
but I don't have any specific experience with the task you are attempting.


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