Apple Shake 4 New Features - Manual (Page 42)

42 Chapter 2 Major Features and New Nodes
AspectRatio
This parameter is a multiplier that allows you to convert pixels of one aspect ratio into
another aspect ratio—for example, from NTSC to PAL, or from high definition (square)
to NTSC. The default value of 1 makes no change to the output. The following table
contains common conversion values:
Note: In some conversion cases, AspectRatio may be left at 1 if the Fit parameter is set
to Resize, which rescales the image horizontally and vertically to match the new
OutputRes.
Fit
The Fit parameter determines how an image fits into the new frame that’s determined
by the OutputRes parameter if the aspect ratio of the FileIn image is different than that
of the final resolution set by the OutputRes parameter. There are two options:
• Fit: Enlarges the image until either the vertical or horizontal resolution of the image
matches that of the outputRes, depending on which is greater. This option maintains
the original aspect ratio of the image, enlarging it as much as possible and leaving
black to fill in the resulting gaps at the sides, or the top and bottom.
• Resize: Rescales the vertical and horizontal resolution of the image so that it fits
within the entire frame of the OutputRes. The image is stretched as necessary to fit
the new resolution.
The Cache Node
The Cache node lets you tell Shake to cache image data at specific points in the node
tree. This gives you explicit control over which parts of the node tree require rendering
while you work. For example, if there is a processor-intensive branch of your node tree
that you’re no longer working on, you can insert a Cache node in between the last
node of that branch and the section of the node tree in which you’re now working.
Afterwards, the currently displayed frame is immediately cached. If you want to cache a
range of frames in order to pre-render that branch of the node tree, you can use the
Render Cache Nodes command. All cached image data is stored within the same cache,
in memory or on disk.
Note: Cache nodes cache image data at the currently set proxy resolution.
Operation Conversion Value
Square to NTSC (4:3) 0.9140, or 1 if Fit is set to Resize
Square to PAL (4:3) 1.1111, or 1 if Fit is set to Resize
NTSC (4:3) to Square (4:3) 1.1111, or 1 if Fit is set to Resize
NTSC (4:3) to PAL (4:3) 1, set Fit to Resize
PAL (4:3) to Square .9375, or 1 if Fit is set to Resize
PAL (4:3) to NTSC (4:3) 1, set Fit to Resize