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Django-Imagekit is smart enough to detect the format from the source file. One (any maybe the only) reason we forced PNG as format is that our previous image conversion tool could not auto-detect the format but we still wanted PNG images with transparency to be handled… transparently :). A nasty side-effect of the forced conversion is that JPEG images were converted to PNG which sometimes increased the file size of these images multiple orders of magnitude. Often a large portion of our page loading times on the frontpage of stadtgestalten comes from these kind of images. Format auto-detection should fix this.
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