This enumeration specifies ImageGear TWAIN capabilities.
| IG_TW_CAP_CUSTOMBASE | Base of custom capabilities. |
| IG_TW_CAP_XFERCOUNT | Number of images the application is willing to accept during this session. |
| IG_TW_ICAP_COMPRESSION | Buffered Memory transfer compression schemes. |
| IG_TW_ICAP_PIXELTYPE | The type of pixel data (B/W, gray, color, etc.). Uses enumIGTWAINPixelType values. |
| IG_TW_ICAP_UNITS | Unit of measure (inches, centimeters, etc.). Uses enumIGTWAINUnits values. |
| IG_TW_ICAP_XFERMECH | Transfer mechanism - used to learn options and set-up for upcoming transfer. Uses enumIGTWAINXferType values. |
| IG_TW_CAP_AUTHOR | The name or other identifying information about the Author of the image. It may include a copyright string. |
| IG_TW_CAP_CAPTION | A general note about the acquired image. |
| IG_TW_CAP_FEEDERENABLED | If TRUE, Source's feeder is available. |
| IG_TW_CAP_FEEDERLOADED | If TRUE, Source has documents loaded in feeder (get only). |
| IG_TW_CAP_TIMEDATE | Date and Time the image was acquired. |
| IG_TW_CAP_SUPPORTEDCAPS | Inquire valid capabilities for Source. |
| IG_TW_CAP_EXTENDEDCAPS | Capabilities negotiated in States 5 & 6. |
| IG_TW_CAP_AUTOFEED | Set to TRUE to enable Source's automatic feeding. |
| IG_TW_CAP_CLEARPAGE | Set to TRUE to eject current page and leave acquire area empty. |
| IG_TW_CAP_FEEDPAGE | Set to TRUE to eject current page and feed next page. |
| IG_TW_CAP_REWINDPAGE | Set to TRUE to do a reverse feed. |
| IG_TW_CAP_INDICATORS | Use the Source's progress indicator (valid only when ShowUI==FALSE). |
| IG_TW_CAP_SUPPORTEDCAPSEXT | Undocumented TWAIN capability. |
| IG_TW_CAP_PAPERDETECTABLE | Determines whether source can detect documents on the ADF or flatbed. |
| IG_TW_CAP_UICONTROLLABLE | Indicates that Source supports acquisitions with UI disabled. |
| IG_TW_CAP_DEVICEONLINE | Determines if hardware is on and ready. |
| IG_TW_CAP_AUTOSCAN | Enables the source's automatic document scanning process. |
| IG_TW_CAP_THUMBNAILSENABLED | Allows an application to request the delivery of thumbnail representations for the set of images that are to be delivered. |
| IG_TW_CAP_DUPLEX | This indicates whether the scanner supports duplex. If so, it further indicates whether one-path or two-path duplex is supported. Uses enumIGTWAINDuplex values. |
| IG_TW_CAP_DUPLEXENABLED | The user can set the duplex option to be TRUE or FALSE. If TRUE, the scanner scans both sides of a paper; otherwise, the scanner will scan only one side of the image. |
| IG_TW_CAP_ENABLEDSUIONLY | Queries an application to see if it implements the new user interface settings dialog. |
| IG_TW_CAP_CUSTOMDSDATA | Allows the application to query the data source to see if it supports the new operation triplets DG_CONTROL/DAT_CUSTOMDSDATA/MSG_GET and DG_CONTROL/DAT_CUSTOMDSDATA/MSG_SET. |
| IG_TW_CAP_ENDORSER | Allows the application to specify the starting endorser / imprinter number. |
| IG_TW_CAP_JOBCONTROL | Allows multiple jobs in batch mode. |
| IG_TW_CAP_ALARMS | Turns specific audible alarms on and off. Uses ImGearAlarms values. |
| IG_TW_CAP_ALARMVOLUME | The volume of a device's audible alarm. Note that this control affects the volume of all alarms; no specific volume control for individual types of alarms is provided. |
| IG_TW_CAP_AUTOMATICCAPTURE | The number of images to automatically capture. This does not refer to the number of images to be sent to the Application, use IG_TW_CAP_XFERCOUNT for that. |
| IG_TW_CAP_TIMEBEFOREFIRSTCAPTURE | Selects the number of seconds before the first picture taken. |
| IG_TW_CAP_TIMEBETWEENCAPTURES | Selects the hundredths of a second to wait between pictures taken. |
| IG_TW_CAP_CLEARBUFFERS | Getting this reports the presence of data in the scanner's buffers. Setting with a value of enumIGTWAINClearBuffers::IG_TW_CB_CLEAR immediately clears the buffers. Uses enumIGTWAINClearBuffers values. |
| IG_TW_CAP_MAXBATCHBUFFERS | Describes the number of pages that the scanner can buffer when IG_TW_CAP_AUTOSCAN is enabled. Uses enumIGTWAINClearBuffers values. |
| IG_TW_CAP_DEVICETIMEDATE | Date and time of a device's clock. |
| IG_TW_CAP_POWERSUPPLY | Get reports the kinds of power available; Current reports the current power supply to use. Uses enumIGTWAINPowerSupply values. |
| IG_TW_CAP_CAMERAPREVIEWUI | Queries the source for UI support for preview mode. |
| IG_TW_CAP_DEVICEEVENT | Selects which events the application wants the source to report. Uses enumIGTWAINDeviceEvents values. |
| IG_TW_CAP_SERIALNUMBER | The serial number of the currently selected source device. |
| IG_TW_CAP_PRINTER | Gets current list of available printer devices; sets the device for negotiation. Uses enumIGTWAINPrinter values. |
| IG_TW_CAP_PRINTERENABLED | Turns the current IG_TW_CAP_PRINTER device on or off. |
| IG_TW_CAP_PRINTERINDEX | Starting number for the IG_TW_CAP_PRINTER device. |
| IG_TW_CAP_PRINTERMODE | Specifies appropriate current IG_TW_CAP_PRINTER device mode. Uses enumIGTWAINPrinterModes values. |
| IG_TW_CAP_PRINTERSTRING | String(s) to be used in the string component when IG_TW_CAP_PRINTER device is enabled. |
| IG_TW_CAP_PRINTERSUFFIX | String to be used as current IG_TW_CAP_PRINTER device's suffix. |
| IG_TW_CAP_LANGUAGE | Allows application and source to identify which languages they have in common. Uses enumIGTWAINLanguages values. |
| IG_TW_CAP_FEEDERALIGNMENT | If TRUE, feeder is centered; FALSE if it is free-floating. Uses enumIGTWAINFeederAlignment values. |
| IG_TW_CAP_FEEDERORDER | Specifies whether feeder starts with top of first or last page. Uses enumIGTWAINFeederOrder values. |
| IG_TW_CAP_REACQUIREALLOWED | Undocumented TWAIN capability. |
| IG_TW_CAP_BATTERYMINUTES | The minutes of battery power remaining on a device. |
| IG_TW_CAP_BATTERYPERCENTAGE | Indicates battery power status. |
| IG_TW_ICAP_AUTOBRIGHT | Enable Source's Auto-brightness function. |
| IG_TW_ICAP_BRIGHTNESS | Source brightness values. |
| IG_TW_ICAP_CONTRAST | Source contrast values. |
| IG_TW_ICAP_CUSTHALFTONE | Square-cell halftone (dithering) matrix to be used. |
| IG_TW_ICAP_EXPOSURETIME | Exposure time used to capture the image, in seconds. |
| IG_TW_ICAP_FILTER | Color characteristics of the subtractive filter applied to the image data. Uses enumIGTWAINFilterType values. |
| IG_TW_ICAP_FLASHUSED | Specifies whether or not the image was acquired using a flash. |
| IG_TW_ICAP_GAMMA | Gamma correction value for the image data. |
| IG_TW_ICAP_HALFTONES | Source halftone patterns. |
| IG_TW_ICAP_HIGHLIGHT | Lightest highlight, values lighter than this value will be set to this value. |
| IG_TW_ICAP_IMAGEFILEFORMAT | File formats for file transfers. |
| IG_TW_ICAP_LAMPSTATE | Whether the lamp is on. |
| IG_TW_ICAP_LIGHTSOURCE | Describes the color characteristic of the light source used to acquire the image. Uses enumIGTWAINLightSource values. |
| IG_TW_ICAP_ORIENTATION | Defines which edge of the paper is the top: Portrait or Landscape. Uses enumIGTWAINOrientation values. |
| IG_TW_ICAP_PHYSICALWIDTH | Maximum width Source can acquire (in IG_TW_ICAP_UNITS). |
| IG_TW_ICAP_PHYSICALHEIGHT | Maximum height Source can acquire (in IG_TW_ICAP_UNITS). |
| IG_TW_ICAP_SHADOW | Darkest shadow, values darker than this value will be set to this value. |
| IG_TW_ICAP_FRAMES | Size and location of frames on page. |
| IG_TW_ICAP_XNATIVERESOLUTION | Native optical resolution of device for x-axis. |
| IG_TW_ICAP_YNATIVERESOLUTION | Native optical resolution of device for y-axis. |
| IG_TW_ICAP_XRESOLUTION | Current/Available optical resolutions for x-axis. |
| IG_TW_ICAP_YRESOLUTION | Current/Available optical resolutions for y-axis. |
| IG_TW_ICAP_MAXFRAMES | Maximum number of frames possible per page. |
| IG_TW_ICAP_TILES | Tiled image data. |
| IG_TW_ICAP_BITORDER | Specifies how the bytes in an image are filled by the Source. Uses enumIGTWAINBitOrder values. |
| IG_TW_ICAP_CCITTKFACTOR | CCITT Compression. |
| IG_TW_ICAP_LIGHTPATH | Image was captured transmissively or reflectively. Uses enumIGTWAINLightPath values. |
| IG_TW_ICAP_PIXELFLAVOR | Sense of the pixel whose numeric value is zero. Uses enumIGTWAINPixelFlavor values. |
| IG_TW_ICAP_PLANARCHUNKY | Color data format - Planar or Chunky. Uses enumIGTWAINColorDataFormats values. |
| IG_TW_ICAP_ROTATION | Source can, or should, rotate image this number of degrees. |
| IG_TW_ICAP_SUPPORTEDSIZES | This specifies the size(s) the Source can/should use to acquire image data. Uses enumIGTWAINSupportedSizes values. |
| IG_TW_ICAP_THRESHOLD | Specifies the dividing line between black and white values. |
| IG_TW_ICAP_XSCALING | Source Scaling value (1.0 = 100%) for x-axis. |
| IG_TW_ICAP_YSCALING | Source Scaling value (1.0 = 100%) for y-axis. |
| IG_TW_ICAP_BITORDERCODES | CCITT Compression. |
| IG_TW_ICAP_PIXELFLAVORCODES | CCITT Compression. |
| IG_TW_ICAP_JPEGPIXELTYPE | JPEG Compression. |
| IG_TW_ICAP_TIMEFILL | CCITT Compression. |
| IG_TW_ICAP_BITDEPTH | Pixel bit depth for Current value of IG_TW_ICAP_PIXELTYPE. |
| IG_TW_ICAP_BITDEPTHREDUCTION | Allows a choice of the reduction method for bit depth loss. Uses enumIGTWAINBitDepthReduction values. |
| IG_TW_ICAP_UNDEFINEDIMAGESIZE | The application will accept undefined image size. |
| IG_TW_ICAP_IMAGEDATASET | Gets or sets the image indices that will be delivered during the standard image transfer. |
| IG_TW_ICAP_EXTIMAGEINFO | Allows the application to query the data source to see if it supports the new operation triplet DG_IMAGE/DAT_EXTIMAGEINFO/MSG_GET. |
| IG_TW_ICAP_MINIMUMHEIGHT | Allows the source to define the minimum height (Y-axis) that the source can acquire. |
| IG_TW_ICAP_MINIMUMWIDTH | Allows the source to define the minimum width (X-axis) that the source can acquire. |
| IG_TW_ICAP_FLIPROTATION | Orients images that flip orientation every other image. Uses enumIGTWAINFlipRotation values. |
| IG_TW_ICAP_BARCODEDETECTIONENABLED | Turns bar code detection on and off. |
| IG_TW_ICAP_SUPPORTEDBARCODETYPES | Provides a list of bar code types that can be detected by current data source. |
| IG_TW_ICAP_BARCODEMAXSEARCHPRIORITIES | Specifies the maximum number of supported search priorities. |
| IG_TW_ICAP_BARCODESEARCHPRIORITIES | A prioritized list of bar code types dictating the order in which they will be sought. |
| IG_TW_ICAP_BARCODESEARCHMODE | Restricts bar code searching to certain orientations, or prioritizes one orientation over another. Uses enumIGTWAINBarcodeSearchModes values. |
| IG_TW_ICAP_BARCODEMAXRETRIES | Restricts the number of times a search will be retried if no bar codes are found. |
| IG_TW_ICAP_BARCODETIMEOUT | Restricts the total time spent on searching for bar codes on a page. |
| IG_TW_ICAP_ZOOMFACTOR | Gets all camera supported lens zooming range or sets the selected zoom value. |
| IG_TW_ICAP_PATCHCODEDETECTIONENABLED | Turns patch code detection on and off. |
| IG_TW_ICAP_SUPPORTEDPATCHCODETYPES | List of patch code types that can be detected by current data source. Uses enumIGTWAINPatchCode values. |
| IG_TW_ICAP_PATCHCODEMAXSEARCHPRIORITIES | Maximum number of search priorities. |
| IG_TW_ICAP_PATCHCODESEARCHPRIORITIES | List of patch code types dictating the order in which patch codes will be sought. Uses enumIGTWAINPatchCode values. |
| IG_TW_ICAP_PATCHCODESEARCHMODE | Restricts patch code searching to certain orientations, or prioritizes one orientation over another. |
| IG_TW_ICAP_PATCHCODEMAXRETRIES | Restricts the number of times a search will be retried if none are found on a page. |
| IG_TW_ICAP_PATCHCODETIMEOUT | Restricts total time for searching for a patch code on a page. |
| IG_TW_ICAP_FLASHUSED2 | For devices that support a flash, setting selects the flash to be used; getting reports the current setting. Uses enumIGTWAINFlashUsed values. |
| IG_TW_ICAP_IMAGEFILTER | For devices that support image filtering, selects the algorithm to be used. Uses enumIGTWAINImageFilter values. |
| IG_TW_ICAP_NOISEFILTER | For devices that support noise filtering, selects the algorithm to be used. Uses enumIGTWAINNoiseFilter values. |
| IG_TW_ICAP_OVERSCAN | For devices that support overscanning, controls whether additional rows or columns are appended to the image. Uses enumIGTWAINOverscanModes values. |
| IG_TW_ICAP_AUTOMATICBORDERDETECTION | Turns automatic border detection on and off. |
| IG_TW_ICAP_AUTOMATICDESKEW | Turns automatic skew detection on and off. |
| IG_TW_ICAP_AUTOMATICROTATE | When TRUE, depends on source to automatically rotate the image. |
| IG_TW_ICAP_JPEGQUALITY | JPEG quality. Uses enumIGTWAINJPEGQuality values, or values in the range 0 - 100. |
| IG_TW_ACAP_AUDIOFILEFORMAT | Informs the application which audio file formats the Source can generate or tells the Source which audio file formats the application can handle. Uses enumIGTWAINAudioFormats values. |
| IG_TW_ACAP_XFERMECH | Allows the Application and Source to identify which audio transfer mechanisms they have in common. |