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Download Nuke 6.2v2 User Guide
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TRANSFORMING ELEMENTS Transforming in 2D Shift+drag to constrain the translation to x or y. Ctrl/Cmd+drag to reposition the pivot point (the point that acts as the center to transformation operations). D. Drag to scale the frame on x. E. Drag to rotate the frame around the pivot point (see “Rotating Elements” on page 238). The transform overlay snaps to typical values. To prevent the snapping, press Shift while dragging. F. Drag to scale the frame on y. Choosing a Filtering Algorithm Spatial transformations involve remapping pixels from their original positions to new positions. The question arises as to what values to assign remapped pixels. In the simplest case, they retain their original values, but this can create problems with image quality, particularly in high contrast areas of the frame. For example, the figure below shows a close up a highcontrast feature that has been rotated clockwise by 45 degrees. The remapped pixels have retained their original values, but the result is a highly aliased, or jaggy, edge: The solution is to apply a more sophisticated filtering algorithm to determine the values of remapped pixels—one that takes into account, in some fashion, the values of neighbouring pixels. For example, applying Nuke’s cubic algorithm to the above rotation, results in a softer, less jagged edge: The Foundry Nuke 6.2v2 227
