deke.com posts about upsampling

Deke's Techniques 292: Enlarging a Low-Res Photograph in Photoshop

Deke shows you how to enlarge a low resolution photograph in Photoshop with optimal results.

Deke's Techniques 288: Upsampling a Layered Composition in Photoshop

Deke explains the fine art of upsampling a layered composition in Photoshop, taking photos, graphics, text, and patterns into account.