User Manual

Angle
This control rotates the image around the axis. Increasing the Angle rotates the image in a
counterclockwise direction. Decreasing the Angle rotates the image in a clockwise direction.
Flip Horizontally and Vertically
Toggle this control on to flip the image along the X- or Y-axis.
Edges
This menu determines how the edges of the image are treated when the edge of the raster
is exposed.
 Canvas: This causes the edges of the image that are revealed to show the current
Canvas Color. This defaults to black with no Alpha and can be set using the Set Canvas
Color node.
 Wrap: This wraps the edges of the image around the borders of the image. This is
useful for seamless images to be panned, creating an endless moving background
image.
 Duplicate: This causes the edges of the image to be duplicated as best as possible,
continuing the image beyond its original size.
 Mirror: Image pixels are mirrored to fill to the edge of the frame.
Filter Method
When rescaling a pixel, surrounding pixels are often used to give a more realistic result. There
are various algorithms for combining these pixels, called filters. More complex filters can give
better results but are usually slower to calculate. The best filter for the job often depends on the
amount of scaling and on the contents of the image itself.
 Box: This is a simple interpolation resize of the image.
 Linear: This uses a simplistic filter, which produces relatively clean and fast results.
 Quadratic: This filter produces a nominal result. It offers a good compromise between
speed and quality.
 Cubic: This produces better results with continuous-tone images. If the images have
fine detail in them, the results may be blurrier than desired.
 Catmull-Rom: This produces good results with continuous-tone images that are resized
down. This produces sharp results with finely detailed images.
 Gaussian: This is very similar in speed and quality to Bi-Cubic.
 Mitchell: This is similar to Catmull-Rom but produces better results with finely detailed
images. It is slower than Catmull-Rom.
 Lanczos: This is very similar to Mitchell and Catmull-Rom but is a little cleaner and also
slower.
 Sinc: This is an advanced filter that produces very sharp, detailed results; however, it
may produce visible “ringing” in some situations.
 Bessel: This is similar to the Sinc filter but may be slightly faster.
Chapter – 108 Transform Nodes 2459