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I'm making an image uploader for a client and working on minimizing file size. Already adjusting quality, setting optimize and progressive, removing exif data, just looking for a way to adjust subsampling and smoothing. Just wondering if there is a php function which can adjust a jpeg's chroma subsampling to 4X2X2 rather than 4X4X4. I don't use IMagick, so I'm wondering if there is some regular php function to do it.

Jimmy Long
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