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exrtrader2018:supported_metadata

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
exrtrader2018/supported_metadata.txt · Last modified: 2017/12/27 10:38 by lightwolf