saving over jpg in ACR

That depends on what you want to do with the images and how much editing they need. You can open them all in camera Raw, though Bridge - ctrl/cmd-R to bypass opening in PS. Make you correction. If you then want to make a saved copy, with the edit baked in, use the save in ACR, just save to another folder, if you can.

OK Sure, that's what I thought might be the case. What is a good workflow in processing a number (100+) through Bridge and camera raw? Other than opening each in PS.

Thanks for your help. 

Hi there,

To overwrite the original JPEG, you would need to open the image in Photoshop from Camera Raw and then save the image through Photoshop.

The Save Image option in Camera Raw saves a new copy of the image to ensure non-destructive editing. If you click on Done in Camera Raw after editing the JPEG, the edits would be saved with the JPEG but the preview of those edits and the values would only be visibile in Camera Raw once you open the image back in Camera Raw. The edits may not be visible in other applications.

Regards,

Nikunj

Within camera raw, no you can't save over, as you found out, for good reasons. You really don't want to resave jpg files, as that just increases the noise compression. Best to keep an original, even better to shoot RAW.