Encoder.Compression フィールド

.NET Framework クラス ライブラリ リファレンス

Encoder.Compression フィールド

圧縮パラメータ カテゴリのグローバル一意識別子を使用して初期化される Encoder オブジェクト。

名前空間: System.Drawing.Imaging
アセンブリ: System.Drawing (system.drawing.dll 内)
構文

Visual Basic (宣言)

Public Shared ReadOnly Compression
 As Encoder

Visual Basic (使用法)

Dim value As Encoder

value = Encoder.Compression

C#

public static readonly Encoder Compression

C++

public:
static initonly Encoder^ Compression

J#

public static final Encoder Compression

JScript

public static final var
 Compression : Encoder

使用例

BMP ファイルから Bitmap オブジェクトを作成する例を次に示します。このコードは、LZW 圧縮された TIFF ファイルとしてイメージを保存します。

Visual Basic

Imports System
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 'Main
    
    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 'Example_SetTIFFCompression

C#

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;
    }
}

C++

#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;
}

J#

import System.* ;
import System.Drawing.* ;
import System.Drawing.Imaging.*;

class Example_SetTIFFCompression
{
    public static void main(String[]
 args)
    {
        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.get_Param().set_Item( 0 , myEncoderParameter );
        myBitmap.Save("ShapesLZW.tif", myImageCodecInfo, myEncoderParameters);
    } //main
   
    private static ImageCodecInfo GetEncoderInfo(String
 mimeType) 
    {
        int j;
        ImageCodecInfo encoders[];
        encoders = ImageCodecInfo.GetImageEncoders();
        for(j = 0; j < encoders.length; j++) {
            if (encoders[j].get_MimeType().Equals(mimeType)) {
                return encoders[j];
            }
        }
        return null ;
    } //GetEncoderInfo
} //Example_SetTIFFCompression

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
Encoder クラス
Encoder メンバ
System.Drawing.Imaging 名前空間