Apple MA434Z/A User Manual - Page 863

To further maximize the quality of transforms, some nodes in Shake (such as CornerPin) let you use separate filter operations for horizontal and vertical transforms. Keep in mind that the default filter option uses mitchell for scaling up, and sinc for scaling down. Applying Separate Filters to X and Y Dimensions If a node does not already have separate filtering options for X and Y transforms (such as the Resize node), you can set up independent filtering for each dimension in two steps. For example, apply one Resize node, set the filter parameter to the desired filter method, then adjust the xSize parameter while leaving the ySize parameter untouched. Next, apply a second Resize node immediately after the first. Set a different filter method, then adjust its ySize parameter. Because both nodes concatenate, the result is computationally and qualitatively efficient. Note: The subpixel parameter in the Resize node affects the way fractional resize is performed. If your resize value is not an integer (for example, 512 zooming to 1024 is an integer by a factor of 2; zooming 512 to 1023 is not an integer, because it is a factor of 1.998), you have subpixel sampling. For Resize, if the new width or height is not an integer (either because it was set that way, or because of a proxy scale), you have a choice to snap to the closest integer (0 = subpixel off ) or generate transparent pixels for the last row and column (1 = subpixel on). Filter box default dirac gauss impulse lanczos mitchell quad sinc triangle Chapter 28 Filters Description Computationally fast, and gives a "boxy" look. Default size is 1 x 1. By default, mitchell is used to resize up, and sinc to resize down. Dirac and impulse are the same. Default size is 0 x 0. Gaussian lacks in sharpness, but is good with ringing and aliasing. Default size is 5 x 5. Fast but lower quality. Default size is 0 x 0. Similar to the sinc filter, but with less sharpness and ringing. Default size is 6 x 6. This is the default filter when scaling up. A good balance between sharpness and ringing, and so a good choice for scaling up. Default size is 4 x 4. This is also known as a high-quality Catmull-Rom filter. Like triangle, but more blur with fewer artifacts. Default size is 3 x 3. This is the default filter when scaling down. Keeps small details when scaling down with good aliasing. Ringing problems make it a questionable choice for scaling up. Default size is 4 x 4. It can also deliver negative values, which can be interesting when working in float/channel bit depth. Not highest quality, but fine for displaying a scaled image on your screen. Default size is 2 x 2. 863