Environment Variables

On startup and during different operations, mrViewer reads several environment variables that allow you to customize its operation.  Here's a list of them:

Variable Explanation Default Value
CTL_MODULE_PATH A string of colon (Unix) or semicolon (Windows) separated paths that mrViewer will use to find .ctl scripts. If unset, mrViewer's ctl directory
MRV_ODT_CTL_DISPLAY_TRANSFORM The CTL script used to transform images from CIExy space for display on your screen transform_display_video
MRV_ODT_ICC_PROFILE The ICC profile attached to the monitor to simulate the output media. None.
MRV_ODT_CTL_DISPLAY_CHROMATICITIES Chromaticities of your display Rec. ITU-R BT.709 chromaticities
MRV_ODT_CTL_DISPLAY_WHITE_LUMINANCE White Luminance of your display 120 candelas per square meter
MRV_ODT_CTL_DISPLAY_SURROUND_LUMINANCE Luminance of the surrounding environment 12 candelas per square meter
DO_NOT_USE_FFMPEG_PNG Use ImageMagick's PNG reader instead of FFMPEG's one. The ImageMagick reader is slower but more compatible and allows all sorts of gaps in the sequence. Not set
MRV_CTL_RT_8bit A default CTL script used to transform 8-bit images from RGB to CIExy space None.
MRV_CTL_RT_16bit A default CTL script used to transform 16-bit images from RGB to CIExy space None.
MRV_CTL_RT_32bit A default CTL script used to transform 32-bit images from RGB to CIExy space None.
MRV_CTL_RT_float A default CTL script used to transform float and half float images from RGB to CIExy space transform_RRT
MRV_ICC_RT_8bit A default ICC profile used to transform 8-bit images from RGB to CIExy space None.
MRV_ICC_RT_16bit A default ICC profile used to transform 16-bit images from RGB to CIExy space None.
MRV_ICC_RT_32bit A default ICC profile used to transform 32-bit images from RGB to CIExy space None.
MRV_ICC_RT_float A default ICC profile used to transform float and half float images from RGB to CIExy space None.
ICC_PROFILES Directory where ICC and ICM profiles reside %WINDIR%/SYSTEM32/spool/drivers/color on Windows and /usr/share/color/icc on Unix
HOME Home directory for user where mrViewer's preferences will be stored $HOME on Unix and %HOMEDIR% on Windows
MRV_SHADER_PATH Directory where mrViewer's hardware shaders reside. Undefined, mrViewer uses a built-in shader.