First if you have a bunch of Jpeg image that were save at quality other then 12 then save a new generation of these images at quality 12 you will loose some image quality. Your better off with the previous generation jpeg that was saves at the lower quality setting. You loose some image quality with each new jpeg generation. That is decode the old generation and then encoding a new generation. You never gain quality. If you do not want to lose quality just Rena or copy the jpeg files to the file name desired.
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