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EXR

Type – Specifies the exr type to be saved: Multichannel, Deep or Normal.

Compression – Allows you to choose the compression type for the output file:

Default
No compression – Disables all compression. 
Run-length – Basic form of compression that is comparable to the one used by Targa/BMP files.
Scanline ZIP – Zip style compression applied to individual scanlines.
Block ZIP – Zip style compression applied to blocks of 16 scanlines at a time. More effective than Scanline Zip, but can be slower to decompress.
PIZ – Uses a new combined wavelet / Huffman compression. This form of compression is quite effective when dealing with grainy images, and often surpasses any of the other options for grainy images.
PXR24 – Converts data to 24 bit, then uses Zip compression. It is lossless for half data and 32bit integer data, and slightly lossy for 32bit float data.
B44 – This form of compression is lossy for half data and stores 32bit data uncompressed.
B44A – An extension to B44 where areas of flat color are further compressed. Regular B44 compresses uniformly, regardless of image content.
DWAA – JPEG-like lossy compression format. Compresses 32 scanlines together. ²
DWAB – Same as DWAA, but compresses blocks of 256 scanlines to achieve better compression ratio.

Use Dwa Compression Level – Enable this option to use the DWA compression level. If this option is disabled, the default value of 45.0 is used. This option is only available for DWAA and DWAB compression types.

Dwa Compression Level – When the Use Dwa Compression Level option is enabled, you can control the compression level from here. This option is only available for DWAA and DWAB compression types.

Bits per Channel – The number of bits for each of the PNG channels (red, green, blue, alpha). Allows you to choose between 16-bit (half float) and 32-bit (full float) precision.

Extra Attributes – Allows you to specify additional attributes for the OpenEXR file. These are of the format attr1=val1;attr2=val2;... where the values can be either integer or floating-point numbers, or lists of numbers in brackets representing vectors, matrices etc. For example: 

 int_attr=53;float_attr=3.14;vec4_attr=(1, 2, 3, 4)

 If a value cannot be recognized as a number or a sequence of numbers, it is assumed to be a string value. 

Auto Data Window – Determines what data window information is written to OpenEXR files. This option works only when the Memory frame buffer option of V-Ray is set to Full.

Render Region – Sets the data window to the render region.
Auto – The data window is determined from the pixels that have non-zero alpha values.
Whole Image – Sets the data window to the image resolution.

Write Integer Ids – When enabled, allows you to write ID information in integer form rather than RGB colors.

Multipart – When enabled, multichannel EXRs are written to a single multi-part file. This feature requires OpenEXR 2 support.

Deep Alpha Colors – Specifies how the alpha is written in the deep .exr file: 

Monochrome – One alpha exr channel is generated, called "A";
RGB – Three color alpha channels are generated: "AR", "AG" and "AB" (red, green, blue alpha);
Monochrome+RGB – Generates both the monochrome alpha channel ("A") and the three color alpha channels ("AR", "AG" and "AB").

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