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exrtrader2018:supported_metadata

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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 tagDescriptionOpenEXR AttributeWritten by exrTrader image filter
LWIMPAR_ASPECTx / y Pixel Aspect.native ✔
LWIMPAR_PIXELWIDTHActual (scanned)Pixel Width in (mm). xDensity ✔
LWIMPAR_FRAMESPERSECONDNumber of Frames per Second. FramesPerSecond ✔
LWIMPAR_BLACKPOINTBlack Point of Layer.
LWIMPAR_WHITEPOINTWhite Point of Layer. WhiteLuminance ✔
LWIMPAR_GAMMA Linearity of RGB Color.always 1 1)
LWIMPAR_PIXELXDIMENSIONValid image width.native ✔
LWIMPAR_PIXELYDIMENSIONValid image height.native ✔
LWIMPAR_EXPOSURETIMEExposure time (reciprocal of shutter speed). Unit is seconds.ExpTime ✔
LWIMPAR_FNUMBERThe actual F-number(F-stop) of lens when the image was taken.Aperture ✔
LWIMPAR_ISOSPEEDRATINGSCCD sensitivity equivalent to Ag-Hr film speedrate. (int)IsoSpeed ✔
LWIMPAR_DATETIMEORIGINALDate/Time of original image taken. This value should not be modified by user program. CapDate ✔
LWIMPAR_FOCALLENGTHFocal length of lens used to take image. Unit is millimeter.FocalLength ✔
LWIMPAR_MAKERNOTEMaker 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_USERCOMMENTStores user comment.Comment ✔ editable
LWIMPAR_APERTUREVALUEThe 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_SUBJECTDISTANCEDistance to focus point, unit is meter.Focus ✔
LWIMPAR_MAKEManufacturer of recording equipment.Make ✔
LWIMPAR_MODELModel name or model number of recording equipment. Model ✔
LWIMPAR_SOFTWAREName and version of the software used.Software ✔
n/aName of the computer that has written the image 2) ComputerName ✔
n/aTimezone offset for the capture date 3) UtcOffset ✔
n/aUsernameOwner ✔

Maker Metadata

LightWave metadata tagDescriptionOpenEXR AttributeWritten by exrTrader image filter
LWMN_COMPANYNAMECompany NameLW.Company ✔
LWMN_FRAMENUMBERCurrent frame numberLW.FrameNumber ✔
LWMN_FIRSTFRAMEFirst frame numberLW.FirstFrame ✔
LWMN_LASTFRAMELast frame numberLW.LastFrame ✔
LWMN_RENDERTIMERender timeLW.Rendertime ✔
LWMN_CAMERANAMECamera NameLW.CameraName ✔
LWMN_CAMERATYPECamera TypeLW.CameraType ✔
LWMN_ANTIALIASINGAntialiasingLW.AA ✔
LWMN_LENSCamera lens nameLW.Lens
LWMN_PARTICLEBLURParticle blur On/OffLW.ParticleBlur ✔
LWMN_MOTIONBLURTYPEMotion blur typeLW.MBType ✔
LWMN_MOTIONBLURAMOUNTMotion blur amountLW.MBAmount ✔
LWMN_MOTIONBLURPASSESMotion blur passes.LW.MBPasses ✔
LWMN_TOTALPOINTSTotal pointsLW.TotalPoints ✔
LWMN_TOTALPOLYGONSTotal polygonsLW.TotalPolygons ✔
LWMN_TOTALMEMORYTotal memoryLW.TotalMemory ✔
LWMN_FRAMESTEPFrame stepLW.Framestep ✔
LWMN_RECONSTRUCTIONFILTERReconstruction filterLW.AAFilter ✔
LWMN_FIELDRENDERINGField renderingLW.FieldRendering ✔
LWMN_RTREFLECTIONSRT reflectionsLW.RTReflections ✔
LWMN_ADAPTIVESAMPLINGAdaptive samplingLW.AdaptiveSampling ✔
LWMN_STEREORENDERStereo renderLW.Stereo ✔
LWMN_RTREFRACTIONSRT refractionsLW.RTRefractions ✔
LWMN_RADIOSITYRadiosityLW.Radiosity ✔
LWMN_RTTRANSPARENCYRT transparencyLW.RTTransparency ✔
LWMN_CAUSTICSCausticsLW.Caustics ✔
LWMN_RENDERTHREADSRender threadsLW.RenderThreads ✔
LWNM_DEPTHOFFIELDDepth of fieldLW.DepthOfField ✔
LWMN_OUTPUTFILESOutput filesLW.OutputFiles ✔
1)
According to the specs, OpenEXR stores linear images only.
2)
Not available on OSX
3)
Unfortunately also not available on OSX
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exrtrader2018/supported_metadata.txt · Last modified: 2017/12/27 10:38 by lightwolf