Encoder.Quality Campo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Ottiene un oggetto Encoder inizializzato con il GUID relativo alla categoria del parametro di qualità.
public: static initonly System::Drawing::Imaging::Encoder ^ Quality;
public static readonly System.Drawing.Imaging.Encoder Quality;
staticval mutable Quality : System.Drawing.Imaging.Encoder
Public Shared ReadOnly Quality As Encoder
Valore del campo
Esempio
Nell'esempio seguente viene creato un Bitmap oggetto da un file BMP. Il codice salva la bitmap in tre file JPEG, ognuno con un livello di qualità diverso.
#using <System.Drawing.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Drawing::Imaging;
static ImageCodecInfo^ GetEncoderInfo( ImageFormat^ format );
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 JPEG codec.
myImageCodecInfo = GetEncoderInfo( ImageFormat->Jpeg );
// Create an Encoder object based on the GUID
// for the Quality parameter category.
myEncoder = Encoder::Quality;
// 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 JPEG file with quality level 25.
myEncoderParameter = gcnew EncoderParameter( myEncoder,__int64(25) );
myEncoderParameters->Param[ 0 ] = myEncoderParameter;
myBitmap->Save( "Shapes025.jpg", myImageCodecInfo, myEncoderParameters );
// Save the bitmap as a JPEG file with quality level 50.
myEncoderParameter = gcnew EncoderParameter( myEncoder,__int64(50) );
myEncoderParameters->Param[ 0 ] = myEncoderParameter;
myBitmap->Save( "Shapes050.jpg", myImageCodecInfo, myEncoderParameters );
// Save the bitmap as a JPEG file with quality level 75.
myEncoderParameter = gcnew EncoderParameter( myEncoder,__int64(75) );
myEncoderParameters->Param[ 0 ] = myEncoderParameter;
myBitmap->Save( "Shapes075.jpg", myImageCodecInfo, myEncoderParameters );
}
static ImageCodecInfo^ GetEncoderInfo( ImageFormat^ format )
{
int j;
array<ImageCodecInfo^>^encoders;
encoders = ImageCodecInfo::GetImageEncoders();
for ( j = 0; j < encoders->Length; ++j )
{
if ( encoders[ j ]->FormatID == format->Guid)
return encoders[ j ];
}
return nullptr;
}
using System;
using System.Drawing;
using System.Drawing.Imaging;
class Example_SetJPEGQuality
{
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 JPEG codec.
myImageCodecInfo = GetEncoderInfo("image/jpeg");
// Create an Encoder object based on the GUID
// for the Quality parameter category.
myEncoder = Encoder.Quality;
// 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 JPEG file with quality level 25.
myEncoderParameter = new EncoderParameter(myEncoder, 25L);
myEncoderParameters.Param[0] = myEncoderParameter;
myBitmap.Save("Shapes025.jpg", myImageCodecInfo, myEncoderParameters);
// Save the bitmap as a JPEG file with quality level 50.
myEncoderParameter = new EncoderParameter(myEncoder, 50L);
myEncoderParameters.Param[0] = myEncoderParameter;
myBitmap.Save("Shapes050.jpg", myImageCodecInfo, myEncoderParameters);
// Save the bitmap as a JPEG file with quality level 75.
myEncoderParameter = new EncoderParameter(myEncoder, 75L);
myEncoderParameters.Param[0] = myEncoderParameter;
myBitmap.Save("Shapes075.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_SetJPEGQuality
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 JPEG codec.
myImageCodecInfo = GetEncoderInfo(ImageFormat.Jpeg)
' Create an Encoder object based on the GUID
' for the Quality parameter category.
myEncoder = Encoder.Quality
' 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 JPEG file with quality level 25.
myEncoderParameter = New EncoderParameter(myEncoder, CType(25L, Int32))
myEncoderParameters.Param(0) = myEncoderParameter
myBitmap.Save("Shapes025.jpg", myImageCodecInfo, myEncoderParameters)
' Save the bitmap as a JPEG file with quality level 50.
myEncoderParameter = New EncoderParameter(myEncoder, CType(50L, Int32))
myEncoderParameters.Param(0) = myEncoderParameter
myBitmap.Save("Shapes050.jpg", myImageCodecInfo, myEncoderParameters)
' Save the bitmap as a JPEG file with quality level 75.
myEncoderParameter = New EncoderParameter(myEncoder, CType(75L, Int32))
myEncoderParameters.Param(0) = myEncoderParameter
myBitmap.Save("Shapes075.jpg", myImageCodecInfo, myEncoderParameters)
End Sub
Private Shared Function GetEncoderInfo(ByVal format As ImageFormat) As ImageCodecInfo
Dim j As Integer
Dim encoders() As ImageCodecInfo
encoders = ImageCodecInfo.GetImageEncoders()
j = 0
While j < encoders.Length
If encoders(j).FormatID = format.Guid Then
Return encoders(j)
End If
j += 1
End While
Return Nothing
End Function 'GetEncoderInfo
End Class
Commenti
La Quality categoria specifica il livello di compressione per un'immagine. Quando viene usato per costruire un EncoderParameteroggetto , l'intervallo di valori utili per la categoria di qualità è compreso tra 0 e 100. Minore è il numero specificato, maggiore è la compressione e quindi la qualità inferiore dell'immagine. Zero ti darebbe l'immagine di qualità più bassa e 100 il più alto.
Quando si passa un parametro a un codificatore di immagini, il parametro viene incapsulato in un EncoderParameter oggetto. Uno dei campi dell'oggetto EncoderParameter è un GUID che specifica la categoria del parametro. Usare i campi statici della Encoder classe per recuperare un Encoder oggetto contenente parametri della categoria desiderata.
I codificatori di immagini incorporati in GDI+ ricevono parametri appartenenti a diverse categorie. La tabella seguente elenca tutte le categorie e il GUID associato a ogni categoria.
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-aa14-108074b7b7b6f9
Version 24d18c76-814a-41a4-bf53-1c219cccf797