ArcObjects Library Reference (DataSourcesRaster)

IPixelBlock3 Interface

Provides access to members that control a PixelBlock.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Description

The IPixelBlock3 interface provides all the functionality of IPixelBlock interface, plus more properties on mask based NoData and SafeArray handling.

Basically, there are two ways to work with NoData mask and pixel values. They are by value (PixelData and NoDataMask properties) and by reference (PixelDataByRef and NoDataMaskByRef). Normally passing pixel values by reference is recommented since it saves memory. However for Java and .Net, passing by value (PixelData) should be used.

Members

		Description
	BytesPerPixel	The number of bytes per pixel for the PixelBlock.
	Clear	Clears a given plane (sets to NoData).
	GetNoDataMaskVal	Gets the NoData mask value for a specified pixel.
	GetVal	The value for a specified pixel.
	HasNoData	Checks if this PixelBlock contains NoData.
	Height	The height of the PixelBlock in pixels.
	Mask	Generates NoData Mask using a given NoData value.
	NoDataMask	The NoData mask for a specified plane.
	NoDataMaskByRef	The NoData mask for a specified plane.
	PixelData	An array of pixels for a specified plane.
	PixelDataByRef	A pointer to an array of pixels for a specified plane.
	PixelType	The pixel type of the PixelBlock.
	Planes	The number of pixel arrays contained in the PixelBlock.
	Width	The width of the PixelBlock in pixels.

CoClasses that implement IPixelBlock3

CoClasses and Classes	Description
PixelBlock	Esri PixelBlock, a container of pixel data.

.NET Samples

Create a custom NoData pixel filter (Code Files: NodataFilter) | Create an NDVI custom raster function (Code Files: NDVICustomFunction) | Create a custom raster function (Code Files: WatermarkFunction)

.NET Related Topics

DataSourcesRaster | How to access pixel data using a raster cursor | How to create a raster dataset