Apple MA434Z/A User Manual - Page 173

Extension .tdx .tga .tif, .tiff .xpm .yuv, .qnt, .qtl, .pal* Image Format Input Channels Alias/ Wavefront Explore Tiled Texture Map BW[A, Z], RGB[A,Z] Targa RGB[A] TIFF BW[A], RGB[A] XPM RGB[A] YUV/Abekas/ RGB Quantel .yuv (10-bit) Same RGB Output Channels Same RGB[A] Same Same Same Same Compression Bit Depth 8, 16, float On/Off 4 options, see below. 8 8, 16, float 8 Uncom- 8 pressed files with YUV encoding Uncompressed files with YUV encoding 16 (10) tmp Files No Yes Yes Yes Yes Format Descriptions The following section discusses some of the more useful image formats (those indicated with an asterisk in the table above) in greater detail. IFF The Shake IFF (.iff ) format is not the same as the Amiga format with the same extension, although they share certain structural similarities. The IFF format is licensed to Alias/Wavefront for use with Maya, so Shake is ideally suited to work with Maya. Since Shake deals with this format internally, you get the best performance by maintaining your intermediate images in this format as well. The IFF format can accomodate 8, 16, or 32 bits per channel, as well as maintain logarithmic information, alpha, and Z channels. Currently, not many packages explicitly support this format, but if the package supports the old TDI (.tdi) format, it works with IFF as well (for example, with Interactive Effects' Amazon 3D Paint). CIN Shake works with images bottom-up, meaning 0,0 is at the bottom-left corner. The Cineon and TIFF formats allow you to write the files either bottom-up or top-down. Because of Shake's bottom-up nature, the I/O time (actual render time remains the same) is four times greater when dealing with top-down Cineon or TIFF files. You can set how Shake writes the images-reading either way is no problem, except for the speed hit. This information is placed in a startup.h file. Chapter 5 Compatible File Formats and Image Resolutions 173