The main problem here is about too large file size of image not image re-sizing
My wordpress website is like a web gallery which contains many images.
Initially, I just uploaded hundreds of images via wordpress media uploader without caring of its file size at all.
However, when i browse my website, it's too slow to load the homepage because the image file size is too large.
Since i don't want to modify images which are already uploaded, is it possible to create a filter or plugin to reduce image filesize (no dimension changes)or reduce its quality on the fly to make the website load faster?
P.S. Anyways, my last resort is to use photoshop to modify images and reduce its quality in order to reduce its file size.