Set this capability to the number of images you are willing to transfer per session.

-2 = default scanner value

-1 = multiple images

>1 = one o more images

The bottom of the rectangle to acquire in inches.

To use this property set UseAcquireFrameValues to true.

The left of the rectangle to acquire in inches.

To use this property set UseAcquireFrameValues to true.

The right of the rectangle to acquire in inches.

To use this property set UseAcquireFrameValues to true.

The top of the rectangle to acquire in inches.

To use this property set UseAcquireFrameValues to true.

Use this capability to have the scanner discard blank images.

Applications never see these images during the scanning session.

Allowed values:

-2 : Indicates that all images will be delivered to the application, none of them will be discarded.

-1 : Scanner source will decide if an image is blank or not and discard as appropriate.

>=0 : Scanner will use it as the byte size cutoff point to identify which images are to be discarded.

If the size of the image is less than or equal to this value, then it will be discarded.

If the size of the image is greater than this value, then it will be kept so that it can be transferred to the Application.

Enables/Disables auto scan.

This capability is intended to boost the performance of a Source.

The fundamental assumption behind AutoScan is that the device is able to capture the number of images indicated by the value of AcceptedImages without waiting for the Application to request the image transfers.

Brightness value. Allowed range is -1000 to +1000.

Allowed values can be assigned to Contrast.CurrentValue property.

To see which values your scanner supports look at Brightness[] array, or Brightness.RangeMin, Brightness.RangeMax and Brightness.RangeStep.

You can also limit scanner user interface allowed values removing some Brightness[] items or changing Brightness.RangeMin, Brightness.RangeMax and Brightness.RangeStep.

CompatibilityMode disable capability set and read (some scanner may crash when you set/get capabilities).

Set this property to true only if you have problems with a specific scanner.

Contrast value. Allowed range is -1000 to +1000.

Allowed values can be assigned to Contrast.CurrentValue property.

To see which values your scanner supports look at Contrast[] array, or Contrast.RangeMin, Contrast.RangeMax and Contrast.RangeStep.

You can also limit scanner user interface allowed values removing some Contrast[] items or changing Contrast.RangeMin, Contrast.RangeMax and Contrast.RangeStep.

Fills TWainParams property with scanner parameters.

Use this method to update parameters with scanner values.

CopyParametersToScanner() method probes if current parameters are valid.

For example, if application assignes a combination of PixelType and YResolution unsupported by scanner, the method restores the PixelType and YResolution value to one supported by scanner.

If True, the physical hardware (e.g., scanner, digital camera, image database, etc.) that represents the image source is attached, powered on, and communicating.

Warning!! Several (almost all) devices still return "true" when they are off or disconnected.

If true, the scanner scans both sides of a paper; otherwise (default), the scanner will scan only one side of the image.

Use this proprety only within multipage component to enable/disable duplex mode.

If true, the scanner scans both sides of a paper; otherwise (default), the scanner will scan only one side of the image.

Use this proprety only within multipage component to enable/disable duplex mode.

If FileTransferis true, uses a file transfer to get images from the scanner (regardness of BufferedTransfer setting). There are three ways to get an image from scanner:

1 - native transfer ( set FileTransfer=False and BufferedTransfer=False )

2 - buffered transfer ( set FileTransfer=False and BufferedTransfer=True )

3 - file transfer ( set FileTransfer=True )

FileTransfer is slow but more compatible.

IEvolution keeps the scanner driver open to improve performance.

Call FreeResources to close and free the scanner driver after a call to Acquire method: this degrade performance but can improve stability.

Applications should not call FreeResources because it is executed when the application exits.

Default allowed values are:

TW_BlackWhite : Black/white (1 bit)

TW_GrayScale : Gray scale (8 bit)

TW_RGB : full RGB (24 bit)

TW_Palette : palette (unsupported)

TW_CMY : CMY (unsupported)

TW_CMYK : CMYK (unsupported)

TW_YUV : YUV (unsupported)

TW_YUVK : YUVK (unsupported)

TW_CIEXYZ : CIEXYZ (unsupported)

Above values can be assigned to PixelType.CurrentValue property. To see which values your scanner supports look at PixelType.Items[] array.

You can also limit scanner user interface allowed values removing some PixelTtype[] items.

If true (default), the scanner will display a progress indicator during acquisition and transfer, regardless of whether the scanner user interface is active.

You can use OnProgress event to display your custom progress indicator.

If ShowSettingsOnly is True the scanner driver will show settings dialog, without acquire the image.

You could use IETWainParams.SourceSettingsSave and IETWainParams.SourceSettingsLoad to handle scanner settings.

Loads source settings from file (previously saved using SourceSettingsSave).

Source settings are filled when IETWainParams.ShowSettingsOnly is true and you call IEImage.AcquireFromTWain().

Loads source settings from file (previously saved using SourceSettingsSave).

Source settings are filled when IETWainParams.ShowSettingsOnly is true and you call IEImage.AcquireFromTWain().

Saves source settings to stream (you can re-load them using SourceSettingsLoad).

Source settings are filled when IETWainParams.ShowSettingsOnly is true and you call IEImage.AcquireFromTWain().

Saves source settings to file (you can re-load them using SourceSettingsLoad).

Source settings are filled when IETWainParams.ShowSettingsOnly is true and you call IEImage.AcquireFromTWain().

For devices that support fixed frame sizes. Defined sizes match typical page sizes.

This specifies the size(s) the Source can/should use to acquire image data.

If True, enables the properties AcquireFrameLeft, AcquireFrameRight, AcquireFrameTop and AcquireFrameBottom.

When True some scanners doesn’t allow user to change the acquisition frame.

Default is False.

If true uses memory handle (default) instead of memory pointer to transfer images.

Some scanners requires this property to be "false".

XResolution is the DPI (Dot per Inch) in the X-axis.

Allowed values can be assigned to XResolution.CurrentValue property.

To see which values your scanner supports look at XResolution[] array, or XResolution.RangeMin, XResolution.RangeMax and XResolution.RangeStep.

You can also limit scanner user interface allowed values removing some XResolution[] items or changing XResolution.RangeMin, XResolution.RangeMax and XResolution.RangeStep.

X-axis scaling value. A value of 1.0 is equivalent to 100% scaling.

Allowed values can be assigned to XScaling.CurrentValue property.

To see which values your scanner supports look at XScaling[] array, or XScaling.RangeMin, XScaling.RangeMax and XScaling.RangeStep.

You can also limit scanner user interface allowed values removing some XScaling[] items or changing XScaling.RangeMin, XScaling.RangeMax and XScaling.RangeStep.

Y-axis scaling value. A value of 1.0 is equivalent to 100% scaling.

Allowed values can be assigned to YScaling.CurrentValue property.

To see which values your scanner supports look at YScaling[] array, or YScaling.RangeMin, YScaling.RangeMax and YScaling.RangeStep.

You can also limit scanner user interface allowed values removing some YScaling[] items or changing YScaling.RangeMin, YScaling.RangeMax and YScaling.RangeStep.