Apple MA434Z/A User Manual - Page 814

overSampling An integer value that represents the numbers of samples per pixel that are taken into account when performing a warp. This parameter is set to 1 by default, which results in faster rendering times. However, extreme warping effects may introduce aliasing artifacts that can be reduced or eliminated by increasing this value, up to a maximum value of 4. Increasing this parameter may cause render times to increase dramatically. Note: Although the slider is limited to a range of 1 to 4, you can enter larger values into this parameter's value field. PinCushion The PinCushion node distorts the corners of the image in and out to mimic a particular type of edge lens distortion. You can push the values below 0 as well. Parameters This node displays the following controls in the Parameters tab: overSampling The actual number of samples per pixel equals this number squared. For better antialiasing, increase the number. xFactor, yFactor The amount of distortion. Adjusting the xFactor bends the sides of the image, while adjusting the yFactor bends the top and bottom. Positive values bow the image outside the frame, and negative values bow the image into the frame. Randomize The Randomize node randomizes the position of each pixel within a certain distance. To randomize the color, create a Rand node, and layer it with your image using an IMult node. Parameters This node displays the following controls in the Parameters tab: overSampling The actual number of samples per pixel equals this number squared. For better antialiasing, increase the number. seed When Shake generates a random pattern of values, you need to make sure for purposes of compositing that you can recreate the same random pattern a second time. In other words, you want to be able to create different random patterns, evaluating each one until you find the one that works best, but then you don't want that particular random pattern to change again. 814 Chapter 27 Warping and Morphing Images