One or more of the following options may be specified:
Option
GUI equivalent
Description
-info
Info button
Prints information about the .vrimg file (resolution, channels present, etc.). This is only supported for .vrimg files created with V-Ray versions 1.48.xx and higher.
-half
Pixel type drop-down
Stores the floating-point data in the .exr file as 16-bit floating point numbers. If this option is not specified, the data is stored as 32-bit floating point numbers.
-sRGB
-
Converts the RGB data from the .vrimg file to the sRGB color space before writing it to the .exr file. Without this option, no color conversion is performed.
-gamma <gamma_value>
-
Applies the specified gamma value to the RGB colors before writing the .exr file. If this option is not specified, the data is stored in linear space.
-channel <name>
Available channels drop-down
Only reads the specified channel from the .vrimg file and writes it as the RGB channel in the output file. No other channels are written to the .exr file. This option can be used to extract the different channels in the .vrimg file to separate image files. Use the -info option for a list of available channels in the file.
-compression <method>
Compression type drop-down
Sets the compression type for the resulting .exr file. If not specified, ZIP compression is used. Currently supported values for <method>are: none, zips, zip, piz, pxr24
-dwaCompressionLevel <level>
-
A floating-point value that controls the compression level when using the lossy DWA compression methods.
-bufsize <buf_size>
Buffer size spinner
The maximum buffer size per channel (in megabytes) that will be used for the conversion. If the image does not fit into that buffer size, the converter will process it in several passes. Larger buffer size means faster conversion, but, obviously, requires more memory. The default is 10 MB per channel, but a larger value, fe.eg. 100 or more is recommended for large files. A value of 0 removes the limit for the buffer. In that case it will try to load the image in one pass which may result in utilizing all available memory.
-dataWindow
Data window checkbox
Attempts to find a rectange in the image that stores non-zero data (based on the alpha channel) and only stores this data window in the OpenEXR file.
-separateFiles
Channels in separate files checkbox
Each render channel is written to its own OpenEXR file. If not specified, a single multichannel OpenEXR file is produced.
-multiPart
Multipart output
Each render channel is written to a separate "part" inside a single OpenEXR file. This allows applications to load each render element separately which may speed up the work when there are many render channels.
-shortChanNames
-
Channel names will have less than 32 characters. Produced .exr file will be compatible with OpenEXR 1.x.
-threads <num>
-
Uses a specified number of computation threads. Default or 0 is equal to the number of processors.
