I read the following:
"When you make adjustments to an image in Camera Raw, such as straightening or cropping, PhotoShop and Bridge preserve the original file data. This way you can edit the image as you desire, export the edited image, and keep the original intact for future use or other adjustments"
How does it keep the original intact? Does it never write over the original file?
Camera Raw writes the parametric edits to DNG, TIFF and JPEG in the .xmp metadata. It creates side car .xmp files for proprietary raw files depending on the Camera Raw preferences.
1.) Just to make sure I understand, Camera Raw writes any changes you make to DNG, TIFF and JPEG in the .xmp metadata. So if I throw the .xmp file away, I lost all the changes I made?
2.) If so, those changes are written in Camera Raw, will Photoshop open the DNG, TIFF, or JPEG and be able to interpret the info in the .xmp?
No...it writes the XMP metadata directly in the files...there are no side car files with DNG, TIFF or JPEGS, only proprietary raw files create actual .xmp side car files.