Introduction to PhotoKit Color 2.0 - Pixel Genius

Saving a copy of the original
At this point when saving, you can choose to manually remove the word "copy" and
therefore over-write your original file. However, this will flatten the file and eliminate any
layers. If you are absolutely sure you do not wish to do any additional work on the image,
you may wish to do this. This will re-compress the image as a JPEG and replace
your original image with your new version of the image. We recommend, however, that
you give serious consideration to this decision. If there is any chance you may wish to
do additional work on the image or that you may need to go back to the original image
for any reason, we suggest you either leave the word "copy" in the file name or use another
name addendum such as "ADJ" to preserve your original.
Preserve all PhotoKit layers using the PSD format
As an alternative, you may decide to keep your image with all the PhotoKit Color layers
intact. This will allow you to come back to the image and make additional changes
without having to worry about problems you may have with JPEG artifacts from repeated
saves while preserving your layers for later editing.
Photoshop’s native file format is .PSD (Photoshop). With a PSD file, anything you create
in a Photoshop file can be saved including image layers, adjustment layers and type
layers. The PSD file format includes a level of compression using a completely lossless
scheme so you can be assured that you'll never suffer recompression artifacts.