Encoder::ColorDepth Field
An Encoder object that is initialized with the globally unique identifier for the color depth parameter category.
Namespace: System.Drawing.Imaging
Assembly: System.Drawing (in System.Drawing.dll)
When you pass a parameter to an image encoder, the parameter is encapsulated in an EncoderParameter object. One of the fields of the EncoderParameter object is a GUID that specifies the category of the parameter. Use the static fields of the Encoder class to retrieve an Encoder that contains parameters of the desired category.
The image encoders that are built into GDI+ receive parameters that belong to several categories. The following table lists all the categories and the GUID associated with each category.
The following example creates a Bitmap object from a BMP file. The code saves the image as a TIFF file that has a color depth of 24 bits per pixel.
#using <System.Drawing.dll> using namespace System; using namespace System::Drawing; using namespace System::Drawing::Imaging; static ImageCodecInfo^ GetEncoderInfo( String^ mimeType ); int main() { Bitmap^ myBitmap; ImageCodecInfo^ myImageCodecInfo; Encoder^ myEncoder; EncoderParameter^ myEncoderParameter; EncoderParameters^ myEncoderParameters; // Create a Bitmap object based on a BMP file. myBitmap = gcnew Bitmap( "C:\\Documents and Settings\\All Users\\Documents\\My Music\\music.bmp" ); // Get an ImageCodecInfo object that represents the TIFF codec. myImageCodecInfo = GetEncoderInfo( "image/tiff" ); // Create an Encoder object based on the GUID // for the ColorDepth parameter category. myEncoder = Encoder::ColorDepth; // Create an EncoderParameters object. // An EncoderParameters object has an array of EncoderParameter // objects. In this case, there is only one // EncoderParameter object in the array. myEncoderParameters = gcnew EncoderParameters( 1 ); // Save the image with a color depth of 24 bits per pixel. myEncoderParameter = gcnew EncoderParameter( myEncoder,__int64(24) ); myEncoderParameters->Param[ 0 ] = myEncoderParameter; myBitmap->Save( "Shapes24bpp.tiff", myImageCodecInfo, myEncoderParameters ); } static ImageCodecInfo^ GetEncoderInfo( String^ mimeType ) { int j; array<ImageCodecInfo^>^encoders; encoders = ImageCodecInfo::GetImageEncoders(); for ( j = 0; j < encoders->Length; ++j ) { if ( encoders[ j ]->MimeType == mimeType ) return encoders[ j ]; } return nullptr; }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
