An example of a transform

The Transform-type nodes

An example of a transform

Let's look at how these Transform keyframes would change the appearance of an image in the final output:

Adding in the units, this is a transform of 3.00 frames East, with -20× rotation and 50% scaling about (0.00E, 7.00S).

This is the image we will use as input, exactly as it was scanned in. We also show its field chart, a small 'target' showing the center of rotation and scaling, and an outline of the camera viewing it:

(Note that because this image is on registration and unaltered, its field chart is initially identical to the scene field chart.)

The E/W keyframe moves the image and its field chart 3.00 frames East using the scene field chart:

The Angle keyframe rotates the image and its field chart through 20× anti-clockwise, about the center set by the Center keyframe (i.e. (0.00E, 7.00S) on the image's field chart):

The Scale keyframe scales the image and its field chart about this same center to 50% of their original size:

It may help you to see the effect if we superimpose the node's input and output, both as seen from the camera's view:

Points to note are:

The move of 3.00 frames East has moved the final image 3.00 frames on the scale of the scene field chart.

The center of rotation and scaling has moved with the image, and is still at (0.00E, 7.00S) on the image's field chart.

The Transform-type nodes

An example of a transform