I owe a panasonic lumix fz10, wich have a high quality leica lenses and a 4 megapixels. I always duplicate my original to process it...and alway save in tiff at 300 dpi up to the last resizing for jpeg on the web, with a quality of at lest 90%. The problems appear as soon as i apply digital effects of toning and blurring on my tiff copies. I Use psp8 and often nik color effect pro wich is not known to create artifacts..The problem is probably a bad workflow or existing artifacts that are for sure amplified with any digital process I guess ! Thank you Cynlee for help!