Hey all, thought I'd share a useful tip with anyone working on loopable N900 wallpapers.
One of the trickiest parts of creating a loopable wallpaper is getting the left edge and the right edge to match. To make it easier, photoshop has a filter called offset (found in filter -> other -> offset...) which shifts your entire image by a specified number of pixels. In an image 3200px wide, shifting it horizontally by +1600px (or -1600px) will move the edges to the center, making it easy to blend them together (of course, exactly how you blend is dependent on what kind of wallpaper you're making).
One of the trickiest parts of creating a loopable wallpaper is getting the left edge and the right edge to match. To make it easier, photoshop has a filter called offset (found in filter -> other -> offset...) which shifts your entire image by a specified number of pixels. In an image 3200px wide, shifting it horizontally by +1600px (or -1600px) will move the edges to the center, making it easy to blend them together (of course, exactly how you blend is dependent on what kind of wallpaper you're making).