You can set options for saving image files, such as the format and whether to preserve layers in an image. Depending on the format you select, other options may be available to set.
Change file-saving options
Save a file in GIF format
Save a file in JPEG format
Save a file in JPEG 2000 format
Save a file in Photoshop EPS formatFor Preview, choose TIFF (8 bits/pixel) for better display quality, or choose TIFF 1‑bit/pixel for a smaller file size.
For Encoding, choose an encoding method: ASCII, Binary, or a JPEG option.
Save a file in Photoshop PDF format
If you've made changes to an Acrobat
Touchup file, but the changes are not reflected when you open the
file, check the Saving File preferences dialog box. Choose Photoshop Elements > Preferences >
Saving Files, and then choose Save Over Current File from the On
First Save menu.
Save a file in PNG format
Save a file in TIFF format