EDIT: Ah, sorry for misread. You have stated that it is not visible in 100% nor exported image. So fortunately this particular case is not sensor moire. It is rather aliasing caused by (simple) downsampling algorithm in viewer code. So for this case is described as "aliasing" in the first link. It can be avoided (if it is product of your manual resize in photo editor) with careful selection of resize alorithm and some treatment. http://www.cambridgeincolour.com/tutori ... or-web.htm In ASP you can do nothing with it, when it occurs in this place. Maybe if you introduce some blur, you will avoid it, but with that you will destroy your image, and the only benefit will be better display within ASP on sub-100% magnifications.