Epson Stylus Pro 4000 Reference Manual page 56

Depending on the media you choose in the Media Type while
Automatic is selected, a slider appears in the Mode box that lets
you choose Quality or Speed. Select Quality when print quality
is more important than print speed. Select Speed when print
speed is more important than print quality.
Note:
Most Windows applications feature paper size and page layout settings
that override similar settings in the printer driver. However, if your
application does not, you should also verify the settings on the printer
driver's Paper menu.
PhotoEnhance
PhotoEnhance mode lets you choose from a variety of
image-correction settings specially designed for photos.
PhotoEnhance does not affect your original data.
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Printing with Windows