Converting j peg to jpeg 2000

I have a large amount of jpeg files which I wish to convert to j peg 2000 because of their better stability over time. I have been saving files as TIFF but their size is now getting a bit much, given that I have about 850,000 files.
At present I individually open each file in Preview and from "File">"Export" I am presented with a drop menu which I have to change everytime from jpeg to jpeg2000 and from 75% to 100%.
Is there a way to block convert files or failing that, a way to change the default settings in Preview so that I don't have to change the format and size every time.?

I have a large amount of jpeg files which I wish to convert to j peg 2000 because of their better stability over time.
That doesn't make even a slight amount of sense. There's nothing more stable about JPEG 2000 than there is for TIFF, standard JPEG, or any other raster format. You can either open them, or you can't. And the only reason you couldn't is that the files were damaged somehow. And that can't happen by just sitting there. A drive could be 1000 years old, and as long as the drive is still readable (and software still exists to open the files), a TIFF or JPEG will still open just as readily as JPEG 2000 file.
By converting from JPEG to JPEG 2000 you are only succeeding in making your images worse! You're taking a lossy compressed format, opening it, and saving it to yet another lossy compressed format. In other words, you're compounding the permanent data loss.
When you do such a conversion, it isn't just rewriting the JPEG to JPEG 2000 without doing anything to the image. It first has to open the file as an uncompressed image (and no, you don't get the original uncompressed pixels back before it was saved as a JPEG), then save it with yet more lossy compression reapplied as JPEG 2000.
If you want to save your images with the best possible image integrity, but still compressed, then save your TIFFs as a TIFF with LZW or ZIP compression. Both of these compression schemes are lossless. You could open and save a file a billion times and assuming no errors occurred, not one pixel of the image will be the slightest bit different from the first time it was saved. You won't save as much space as even the least compressed JPEG (highest quality), but your images will preserve 100% of their original values.

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Hamper wrote:
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