To access the configuration options:double click on JPEG Format Explorer, or click on the Edit Preferences button in the JPEG window (lower right corner).
If the site where the image will be published allow it, the recommended Quality for compression is the highest. See also Resizing and Publishing.
Quality: Specifies a quality factor in the range [0,100].
Optimized: Enables optimized entropy coding.
No-optimized: Disables optimized entropy coding.
Arithmetic: Selects the arithmetic entropy coding algorithm (currently unsupported by the standard JPEG file format module).
Progressive: Create a JPEG image that can be loaded by successive layers of increasing resolution.
No-progressive: Do not create a progressive JPEG image.