Do you actually know what jpeg artifacting is? And don't take the question as an insult because I'm not trying to insult you. I just wanted to know if you knew what it was.<br /><br />I work with computer graphics on a daily basis and this type of artifacting is easy to spot. The first and second link you provided has no artifacts I can see and its not enlarged.<br /><br />When you enlarge images, the artifacts start to appear. Note the last link you provided that shows the hill enlarged. Pixelization is clearly evident in the deep gouged areas. Jpeg artifacts begin to appear as well. Not a lot of them, but they are the symettrical fuzzy vertical lines scattered throughout the image and do not appear in the original.<br /><br />Your images, the ones I have seen so far are extreme enlargements and subject to heavy jpeg artifacting and pixelization. Enlarged enough, you will see the very building blocks of data that form the image...the pixels. But at such close range, you loose resolution.<br /><br />For example, lets say you imaged the mars rover landing site and the original image is twice the resolution necessary to see the rover.<br /><br />You enlarge it perhaps thinking the rover will be visible.<br /><br />It won't because enlarging simply increases the size of the data that was possible to obtain. Try enlarging human faces and you'll see what I'm talking about. Enlarge areas like the eyes and see that at pixel level...the only vaguely resemble a human eye.<br /><br />Enlarging an image past a certain point does not reveal anything but the way images are made digitally. I hope this helps you gain a better understanding of the imaging process. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>