Encoder.Transformation Champ

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

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

 staticval mutable Transformation : System.Drawing.Imaging.Encoder

Public Shared ReadOnly Transformation As Encoder 

Valeur de champ

Exemples

L’exemple suivant crée un Bitmap objet à partir d’un fichier JPEG. Le code fait pivoter l’image de 90 degrés et l’enregistre dans un fichier JPEG distinct.

#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 JPEG file.
   myBitmap = gcnew Bitmap( "Shapes.jpg" );
   
   // Get an ImageCodecInfo object that represents the JPEG codec.
   myImageCodecInfo = GetEncoderInfo( "image/jpeg" );
   
   // Create an Encoder object based on the GUID
   // for the Transformation parameter category.
   myEncoder = Encoder::Transformation;
   
   // 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 );
   
   // Rotate the image 90 degrees, and save it as a separate JPEG file.
   myEncoderParameter = gcnew EncoderParameter( myEncoder,(__int64)EncoderValue::TransformRotate90 );
   myEncoderParameters->Param[ 0 ] = myEncoderParameter;
   myBitmap->Save( "ShapesR90.jpg", 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_RotateJPEG
{
    public static void Main()
    {
        Bitmap myBitmap;
        ImageCodecInfo myImageCodecInfo;
        Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;
                     
        // Create a Bitmap object based on a JPEG file.
        myBitmap = new Bitmap("Shapes.jpg");
                     
        // Get an ImageCodecInfo object that represents the JPEG codec.
        myImageCodecInfo = GetEncoderInfo("image/jpeg");
                     
        // Create an Encoder object based on the GUID
        // for the Transformation parameter category.
        myEncoder = Encoder.Transformation;
                     
        // 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);
                     
        // Rotate the image 90 degrees, and save it as a separate JPEG file.
        myEncoderParameter = new EncoderParameter(
            myEncoder,
            (long)EncoderValue.TransformRotate90);
        myEncoderParameters.Param[0] = myEncoderParameter;
        myBitmap.Save("ShapesR90.jpg", 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_RotateJPEG
    
    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 JPEG file.
        myBitmap = New Bitmap("Shapes.jpg")
        
        ' Get an ImageCodecInfo object that represents the JPEG codec.
        myImageCodecInfo = GetEncoderInfo("image/jpeg")
        
        ' Create an Encoder object based on the GUID
        ' for the Transformation parameter category.
        myEncoder = Encoder.Transformation
        
        ' 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)
        
        ' Rotate the image 90 degrees, and save it as a separate JPEG file.
        myEncoderParameter = New EncoderParameter(myEncoder, Fix(EncoderValue.TransformRotate90))
        myEncoderParameters.Param(0) = myEncoderParameter
        myBitmap.Save("ShapesR90.jpg", 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

Remarques

Lorsque vous passez un paramètre à un encodeur d’image, le paramètre est encapsulé dans un EncoderParameter objet. L’un des champs de l’objet EncoderParameter est un GUID qui spécifie la catégorie du paramètre. Utilisez les champs statiques de la Encoder classe pour récupérer un Encoder qui contient les paramètres de la catégorie souhaitée.

Les encodeurs d’images intégrés à GDI+ reçoivent des paramètres qui appartiennent à plusieurs catégories. Le tableau suivant répertorie toutes les catégories et le GUID associé à chaque catégorie.

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

S’applique à