I dont think you're explaining yourself that well, if I understand you you want detail in an image when you zoom in? If so its not the software but the camera? Could you link an image as an example?
Picasa is definately the best I've used, you could also try Gimp but its a little more complex and not as user friendly.
Hope thats of some help.
I can zoom on a photo w/o breaking up the details. I use Picasa now and then for some photos. My small camera never came with any good s/w other than basic stuff.
Basically, I want sharp details of a photo that I zoomed-in on and point to an area of concern. Its no fun when what's required is all fuzzy, etc. and makes the zoom-in no good. I do OK when I do my own pics but fail rather miserably when finding a pic that could explain a problem but usually they fail upon zoom-in. I hope I explained this right, any help?