Apple MA434Z/A User Manual - Page 170

Nodes That Create tmp Files Certain nodes also create tmp files of their own during the processing of a script. This is required for nodes that drastically change the X, Y position of an image's pixels during rendering. For example, if you rotate an image 90 degrees, the pixel in the lower right now moves to the upper right. In order to process this, Shake creates a tmp file that includes as much information as necessary to calculate the image. A tiling system is used, so these tmp files are typically much smaller than those created during I/O. The nodes that create tmp files include the following: • Move2D • Move3D • Rotate • Orient • Flip • All Warps (Warper, Morpher, WarpX, DisplaceX, Turbulate, and so on) By default, temporary files are written to: /var/tmp. To relocate the temporary directory, set the environment variable TMPDIR: setenv TMPDIR /more_disk_space/tmp Table of Supported File Formats The table in this section outlines all of the image formats that Shake supports, with columns for the file extension, image format, supported input and output channels, compression options, bit depth, and tmp file support of each format. Shake supports several combinations of the following input channels: • BW: Black and White • RGB: Red, Green, and Blue • A: Alpha Channel • Z: Z channel, for depth For example, BW[A] is either BW or BWA. BW[A][Z] is any combination of BW, alpha, and Z. RGB[A] and RGB[A,Z] are optional additions of alpha or Z channels. Note: Targa and SGI have different input/output options for channels. When you write a BWA image, it is converted to RGBA. Also, many options must be explicitly stated when in command-line mode. For example, Cineon and JPEG files always write in RGB unless you specify every argument found in the FileOut node for Cineon or JPEG in the Shake interface. Compression Controls Compression controls indicate any special compression techniques. Note that Cineon and YUV have no compression. 170 Chapter 5 Compatible File Formats and Image Resolutions