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Table of Contents
Supported Metadata
exrTrader supports all of the metadata provided by LightWave 3D when using the exrTrader image loader and saver, the exrTrader image filter supports a selection of metadata.
The metadata written by the exrTrader image saver is provided by LightWave 3D. The metadata written by the image filter is generated by exrTrader.
The following two tables list the metadata tags as documented in the LightWave 3D SDK, their content and the equivalent attribute as saved and loaded by exrTrader.
The metadata supported by LightWave mirrors EXIF tags which have been designed for digital photography. Tags that don't apply to OpenEXR images have been omitted.
Basic Metadata
| LightWave metadata tag | Description | OpenEXR Attribute | Written by exrTrader image filter |
|---|---|---|---|
| LWIMPAR_ASPECT | x / y Pixel Aspect. | native | ✔ |
| LWIMPAR_PIXELWIDTH | Actual (scanned)Pixel Width in (mm). | xDensity | ✔ |
| LWIMPAR_FRAMESPERSECOND | Number of Frames per Second. | FramesPerSecond | ✔ |
| LWIMPAR_BLACKPOINT | Black Point of Layer. | ||
| LWIMPAR_WHITEPOINT | White Point of Layer. | WhiteLuminance | ✔ |
| LWIMPAR_GAMMA | Linearity of RGB Color. | always 1 1) | |
| LWIMPAR_PIXELXDIMENSION | Valid image width. | native | ✔ |
| LWIMPAR_PIXELYDIMENSION | Valid image height. | native | ✔ |
| LWIMPAR_EXPOSURETIME | Exposure time (reciprocal of shutter speed). Unit is seconds. | ExpTime | ✔ |
| LWIMPAR_FNUMBER | The actual F-number(F-stop) of lens when the image was taken. | Aperture | ✔ |
| LWIMPAR_ISOSPEEDRATINGS | CCD sensitivity equivalent to Ag-Hr film speedrate. (int) | IsoSpeed | ✔ |
| LWIMPAR_DATETIMEORIGINAL | Date/Time of original image taken. This value should not be modified by user program. | CapDate | ✔ |
| LWIMPAR_FOCALLENGTH | Focal length of lens used to take image. Unit is millimeter. | FocalLength | ✔ |
| LWIMPAR_MAKERNOTE | Maker dependent internal data. Some of maker such as Olympus/Nikon/Sanyo etc. uses IFD format for this area. | See table of Maker Metadata below | ✔ |
| LWIMPAR_USERCOMMENT | Stores user comment. | Comment | ✔ editable |
| LWIMPAR_APERTUREVALUE | The actual aperture value of lens when the image was taken. To convert this value to ordinary F-number (F-stop), calculate this value's power of root 2 (=1.4142). For example, if value is '5', F-number is 1.4142^5 = F5.6. | Aperture | ✔ |
| LWIMPAR_SUBJECTDISTANCE | Distance to focus point, unit is meter. | Focus | ✔ |
| LWIMPAR_MAKE | Manufacturer of recording equipment. | Make | ✔ |
| LWIMPAR_MODEL | Model name or model number of recording equipment. | Model | ✔ |
| LWIMPAR_SOFTWARE | Name and version of the software used. | Software | ✔ |
| n/a | Name of the computer that has written the image 2) | ComputerName | ✔ |
| n/a | Timezone offset for the capture date 3) | UtcOffset | ✔ |
| n/a | Username | Owner | ✔ |
Maker Metadata
| LightWave metadata tag | Description | OpenEXR Attribute | Written by exrTrader image filter |
|---|
LWMN_COMPANYNAME Company Name LW.Company
LWMN_FRAMENUMBER Current frame number LW.FrameNumber
LWMN_FIRSTFRAME First frame number LW.FirstFrame
LWMN_LASTFRAME Last frame number LW.LastFrame
LWMN_RENDERTIME Render time LW.Rendertime
LWMN_CAMERANAME Camera Name LW.CameraName
LWMN_CAMERATYPE Camera Type LW.CameraType
LWMN_ANTIALIASING Antialiasing LW.AA
LWMN_LENS Camera lens name LW.Lens
LWMN_PARTICLEBLUR Particle blur On/Off LW.ParticleBlur
LWMN_MOTIONBLURTYPE Motion blur type LW.MBType
LWMN_MOTIONBLURAMOUNT Motion blur amount LW.MBAmount
LWMN_MOTIONBLURPASSES Motion blur passes. LW.MBPasses
LWMN_TOTALPOINTS Total points LW.TotalPoints
LWMN_TOTALPOLYGONS Total polygons LW.TotalPolygons
LWMN_TOTALMEMORY Total memory LW.TotalMemory
LWMN_FRAMESTEP Frame step LW.Framestep
LWMN_RECONSTRUCTIONFILTER Reconstruction filter LW.AAFilter
LWMN_FIELDRENDERING Field rendering LW.FieldRendering
LWMN_RTREFLECTIONS RT reflections LW.RTReflections
LWMN_ADAPTIVESAMPLING Adaptive sampling LW.AdaptiveSampling
LWMN_STEREORENDER Stereo render. LW.Stereo
LWMN_RTREFRACTIONS RT refractions LW.RTRefractions
LWMN_RADIOSITY Radiosity LW.Radiosity
LWMN_RTTRANSPARENCY RT transparency LW.RTTransparency
LWMN_CAUSTICS Caustics LW.Caustics
LWMN_RENDERTHREADS Render threads LW.RenderThreads
LWNM_DEPTHOFFIELD Depth of field LW.DepthOfField
LWMN_OUTPUTFILES Output files LW.OutputFiles
