NOTE: Now that I see on the Shopify url filters page that Shopify can provide converted versions server-side this probably isn't needed.
A kludgy Python script to find all product images in a Shopify store that are PNGs and replace them with JPGs. Not terribly well tested, so use with caution.
This will authenticate using the information in shopify_img_convert.ini and
then loop over every image for every product in the store, checking for PNGs
(based on the content-type HTTP header from a HEAD request). If a PNG is
found it is downloaded and converted to JPG, and a new image object is uploaded
in the same position, in place of the original.
Requires: