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Image.Save Method (String, ImageCodecInfo, EncoderParameters)

Saves this Image to the specified file, with the specified encoder and image-encoder parameters.

Namespace:  System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

public void Save(
	string filename,
	ImageCodecInfo encoder,
	EncoderParameters encoderParams
)

Parameters

filename
Type: System.String

A string that contains the name of the file to which to save this Image.

encoder
Type: System.Drawing.Imaging.ImageCodecInfo

The ImageCodecInfo for this Image.

encoderParams
Type: System.Drawing.Imaging.EncoderParameters

An EncoderParameters to use for this Image.

ExceptionCondition
ArgumentNullException

filename or encoder is null.

ExternalException

The image was saved with the wrong image format.

-or-

The image was saved to the same file it was created from.

Saving the image to the same file it was constructed from is not allowed and throws an exception.

The following example creates a Bitmap object from a BMP file. The code saves the bitmap to three JPEG files, each with a different quality level.

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;
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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