Apple MA434Z/A User Manual - Page 176
Support for Data Compression, OpenEXR Proxy Handling, For More Information, FileOut, PXR 24
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Support for Data Compression The OpenEXR format supports several codecs, with options for either lossless or lossy compression. Compression ratios range from 2:1 to 3:1. Note: By default, FileOut nodes set to output OpenEXR images default to the Piz codec. The following codec information appears courtesy of Industrial Light & Magic: • none: No compression is applied. • RLE: (Lossless) Differences between horizontally adjacent pixels are run-length encoded. This method is fast, and works well for images with large flat areas. But for photographic images, the compressed file size is usually between 60 and 75 percent of the uncompressed size. • ZIP: (Lossless) Differences between horizontally adjacent pixels are compressed using the open source zlib library. ZIP decompression is faster than PIZ decompression, but ZIP compression is significantly slower. Photographic images tend to shrink to between 45 and 55 percent of their uncompressed size. • PXR 24: (Lossy) After reducing 32-bit floating-point data to 24 bits by rounding, differences between horizontally adjacent pixels are compressed with zlib, similar to ZIP. PXR24 compression preserves image channels of type HALF and UINT exactly, but the relative error of FLOAT data increases to about 3°-10-5.This compression method works well for depth buffers and similar images, where the possible range of values is very large, but where full 32-bit floating-point accuracy is not necessary. Rounding improves compression significantly by eliminating the pixels' eightleast significant bits, which tend to be very noisy, and difficult to compress. • Piz: (Lossless): This is the default compression method used by Shake. A wavelet transform is applied to the pixel data, and the result is Huffman-encoded.This scheme tends to provide the best compression ratio for typical film images. Files are compressed and decompressed at roughly the same speed. For photographic images with film grain, the files are reduced to between 35 and 55 percent of their uncompressed size. OpenEXR Proxy Handling Shake can read both tiled and scanline OpenEXR images. Scanline files contain a single image at a set resolution, but tiled files hold several versions of the same image at a variety of resolutions, for use as proxies in supporting applications. Shake's proxy mechanism does not take advantage of tiled images. As a result, Shake defaults to reading in the highest available tiled resolution. For More Information More information about the OpenEXR format can be found at http:// www.openexr.com. 176 Chapter 5 Compatible File Formats and Image Resolutions
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