Photoshop document and go to File / Save As...
the Format menu, scroll down to Photoshop PDF. Click the Save button.
you click the Save Button the PDF Options window will open. In this
window you will need to select your PDF Quality. 5 is a good setting
for most non-comercial jobs. For comercial jobs it is recomended that
you contact the printer for the best setting. when unsure it is always
best to set the quality to the highest setting.