Encoder.Compression Bidang

Definisi

Ruang nama:

System.Drawing.Imaging

Rakitan:

System.Drawing.Common.dll

Paket:

System.Drawing.Common v8.0.0

Sumber:

Encoder.cs

Objek Encoder yang diinisialisasi dengan pengidentifikasi unik global untuk kategori parameter kompresi.

public: static initonly System::Drawing::Imaging::Encoder ^ Compression;

public static readonly System.Drawing.Imaging.Encoder Compression;

 staticval mutable Compression : System.Drawing.Imaging.Encoder

Public Shared ReadOnly Compression As Encoder 

Nilai Bidang

Encoder

Contoh

Contoh berikut membuat Bitmap objek dari file BMP. Kode menyimpan gambar sebagai file TIFF yang memiliki kompresi LZW.

#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( "Shapes.bmp" );
   
   // Get an ImageCodecInfo object that represents the TIFF codec.
   myImageCodecInfo = GetEncoderInfo( "image/tiff" );
   
   // Create an Encoder object based on the GUID
   // for the Compression parameter category.
   myEncoder = Encoder::Compression;
   
   // 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 bitmap as a TIFF file with LZW compression.
   myEncoderParameter = gcnew EncoderParameter( myEncoder,(__int64)EncoderValue::CompressionLZW );
   myEncoderParameters->Param[ 0 ] = myEncoderParameter;
   myBitmap->Save( "ShapesLZW.tif", 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;
}

using System;
using System.Drawing;
using System.Drawing.Imaging;
class Example_SetTIFFCompression
{
    public static void Main()
    {
        Bitmap myBitmap;
        ImageCodecInfo myImageCodecInfo;
        Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;
                     
        // Create a Bitmap object based on a BMP file.
        myBitmap = new Bitmap("Shapes.bmp");
                     
        // Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff");
                     
        // Create an Encoder object based on the GUID
        // for the Compression parameter category.
        myEncoder = Encoder.Compression;
                     
        // 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 = new EncoderParameters(1);
                     
        // Save the bitmap as a TIFF file with LZW compression.
        myEncoderParameter = new EncoderParameter(
            myEncoder,
            (long)EncoderValue.CompressionLZW);
        myEncoderParameters.Param[0] = myEncoderParameter;
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters);
    }
    private static ImageCodecInfo GetEncoderInfo(String mimeType)
    {
        int j;
        ImageCodecInfo[] encoders;
        encoders = ImageCodecInfo.GetImageEncoders();
        for(j = 0; j < encoders.Length; ++j)
        {
            if(encoders[j].MimeType == mimeType)
                return encoders[j];
        }
        return null;
    }
}

Imports System.Drawing
Imports System.Drawing.Imaging


Class Example_SetTIFFCompression
    
    Public Shared Sub Main() 
        Dim myBitmap As Bitmap
        Dim myImageCodecInfo As ImageCodecInfo
        Dim myEncoder As Encoder
        Dim myEncoderParameter As EncoderParameter
        Dim myEncoderParameters As EncoderParameters
        
        ' Create a Bitmap object based on a BMP file.
        myBitmap = New Bitmap("Shapes.bmp")
        
        ' Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff")
        
        ' Create an Encoder object based on the GUID
        ' for the Compression parameter category.
        myEncoder = Encoder.Compression
        
        ' 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 = New EncoderParameters(1)
        
        ' Save the bitmap as a TIFF file with LZW compression.
        myEncoderParameter = New EncoderParameter(myEncoder, Fix(EncoderValue.CompressionLZW))
        myEncoderParameters.Param(0) = myEncoderParameter
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters)
    
    End Sub
    
    Private Shared Function GetEncoderInfo(ByVal mimeType As String) As ImageCodecInfo 
        Dim j As Integer
        Dim encoders() As ImageCodecInfo
        encoders = ImageCodecInfo.GetImageEncoders()
        
        j = 0
        While j < encoders.Length
            If encoders(j).MimeType = mimeType Then
                Return encoders(j)
            End If
            j += 1
        End While
        Return Nothing
    
    End Function 'GetEncoderInfo
End Class

Keterangan

Saat Anda meneruskan parameter ke encoder gambar, parameter dienkapsulasi dalam EncoderParameter objek. Salah satu bidang EncoderParameter objek adalah GUID yang menentukan kategori parameter. Gunakan bidang Encoder statis kelas untuk mengambil Encoder yang berisi parameter kategori yang diinginkan.

Encoder gambar yang disertakan dalam parameter penerimaan GDI+ yang termasuk dalam beberapa kategori. Tabel berikut mencantumkan semua kategori dan GUID yang terkait dengan setiap kategori.

ChrominanceTable f2e455dc-09b3-4316-8260-676ada32481c

ColorDepth 66087055-ad66-4c7c-9a18-38a2310b8337

Compression e09d739d-ccd4-44ee-8eba-3fbf8be4fc58

LuminanceTable edb33bce-0266-4a77-b904-27216099e717

Quality 1d5be4b5-fa4a-452d-9cdd-5db35105e7eb

RenderMethod 6d42c53a-229a-4825-8bb7-5c99e2b9a8b8

SaveFlag 292266fc-ac40-47bf-8cfc-a85b89a655de

ScanMethod 3a4e2661-3109-4e56-8536-42c156e7dcfa

Transformation 8d0eb2d1-a58e-4ea8-aa14-108074b7b6f9

Version 24d18c76-814a-41a4-bf53-1c219cccf797

Lihat juga

• Menggunakan Encoder dan Decoder Gambar di GDI Terkelola+