Epson 440 - Manual (Page 201)

Image Resolution and Image Size
The resolution of your original image affects the quality of your printouts.
Generally, the higher the resolution, the better the print quality. However,
keep in mind that the higher the resolution, the longer the wait for
processing and printing a document.
Generally, the printed image size is in inverse proportion to the image
resolution, as shown below. The larger the image size, the lower the
image resolution. Conversely, the smaller the image size, the higher the
image resolution.
Note:
Some applications have a function that can correct this relationship.
300 pixel
225 pixel
300 dpi
Print
Print
225 pixel
300 pixel
150 dpi
4-5aa
B
R
Easter2 Ref.
Rev.b
A5 size Appendix B
05-20-97 DR, pass 0
Tips for Color Printing B-5