In this tutorial, you'll see how to use the Scale Node in the Blender Compositor to manipulate an image. You'll see how to stretch it, spin/rotate, and have all sorts of fun with uniform linear distortion. The clip discusses the difference between resolution handling between the renderer and the node system. Hence we have the scale node to scale an input image at one resolution to match the render resolution. I discuss using Absolute scaling, and relative/percentage scaling, relative aspect ratios, including 16:9 and 4:3.
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