2008

available are color transforms to be applied, file compression type, and
additional attributes.
Interface
Compression Type Lets you choose the method of file compression. The
OpenEXR API provides for three general types of lossless compression,
including two different methods of Zip compression. For most images without
a lot of grain, the two Zip compression methods seem to work best, while the
PIZ compression algorithm is better suited to grainy images. The following
options are available:
■ None Disables all compression.
■ Run Length Encoding (RLE) A basic form of compression comparable to
that used by standard Targa files.
■ Zip (per scanline) Zip-style compression applied to individual scanlines.
■ Zip (16 scanline blocks) Zip-style compression applied to blocks of 16
scanlines at time. This tends to be the most effective style of compression
to use with rendered images that do not have film grain applied.
■ PIZ ( wavelet compression ) Uses a combined wavelet/Huffman
compression. This form of compression is best for grainy images.
Standard Channels group
The standard channels in an image are: red, green, blue, and alpha
(transparency). This group lets you choose the general type of OpenEXR file
to save, as well as which of the four channels to save with the file. The most
widely supported format is Half Float - 64 bpp format. This stores each channel
OpenEXR Files | 7143