DPP and Picasa both certainly use some "sharpening" tools. The amount, type, and occurrence of sharpening can vary greatly from one program to the next. It could be any combination of:
  • Demosaic
  • Resample
  • Sharpen



Picasa and DPP only give you control over the last option, but the one or both of the first two options may be the reason that you percieve a difference.