I'm pretty new here found via google cos I've been having some issues with a couple of photographs I could do with some advice on fixing.
It goes like this, on my high resolution images when I zoom in 100% my images have alot of grainy-ness on them, here's some example images of zoomed out and zoomed in
Is there some sort of post processing that can fix this issue, I'd really appreciate it if someone could hand me some sort of pointer or tutorial. Thanks!

(if needed; I used a Canon EOS 400D Software; Adobe Photoshop CS3





