Hi

I have my pictures in aperture and i edit them towhead i want. I then upload them to flickr but on some photos where there is no cloud in the sky has some very very faint lines through the sky, i go back to aperture but they are not there, also i have photos of a lighthouse and sea defence groynes, Spelt right ??? lol, and other objects again on aperture great but upload to flickr and i have a halo around the very edge of the abject, can anybody shed some light on the matter, no pun intended lol.

Many thanks Tracey