Note: This tutorial was done using Adobe Photoshop 7.0

There is always a way to make things in Photoshop, this tutorial will teach you how to make a smooth wavy selection, also it will teach you how to make any selection with rough corners smoother. Normally if you want to make a wave and if you don't know how best to do it, you would try to do it with Elliptical Marquee Tool, which would not bring a desired result.