Apple Shake 4 - Manual (Page 130)

130 Chapter 3 Adding Media, Retiming, and Remastering
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.
Working With Extremely High-Resolution Images
These guidelines are specifically for high-resolution images of 4K and 6K. The following
discussion is based on the premise that you have a massive amount of RAM for your
interactive workstation (at least 1 GB).
Although Shake works with any resolution, there is a default crop on Viewers in the
interface of 4096 x 4096 pixels. This protects the user in case a zoom of 1000 is applied
to a 2K plate. Instead of trying to render an enormous image, only the lower-left corner
up to 4096 pixels is rendered in the interface. This is fine for normal HD or film
production, but the cropping takes effect if you read in 6K IMAX plates. This limitation
is only in the interface—images rendered to disk are at the uncropped full 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