docs-desktop/dotnet-desktop-guide/framework/winforms/advanced/how-to-determine-the-parameters-supported-by-an-encoder.md

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title	ms.date	dev_langs	helpviewer_keywords	ms.assetid
How to: Determine the Parameters Supported by an Encoder	03/30/2017	csharp vb	encoder parameters [Windows Forms], determining supported	f47ae459-e3ce-4d41-a140-2f6c6aea3f44

How to: Determine the Parameters Supported by an Encoder

You can adjust image parameters, such as quality and compression level, but you must know which parameters are supported by a given image encoder. The xref:System.Drawing.Image class provides the xref:System.Drawing.Image.GetEncoderParameterList%2A method so that you can determine which image parameters are supported for a particular encoder. You specify the encoder with a GUID. The xref:System.Drawing.Image.GetEncoderParameterList%2A method returns an array of xref:System.Drawing.Imaging.EncoderParameter objects.

Example

The following example code outputs the supported parameters for the JPEG encoder. Use the list of parameter categories and associated GUIDs in the xref:System.Drawing.Imaging.Encoder class overview to determine the category for each parameter.

[!code-csharpUsingImageEncodersDecoders#3] [!code-vbUsingImageEncodersDecoders#3]

Compiling the Code

This example requires:

• A Windows Forms application.

• A xref:System.Windows.Forms.PaintEventArgs, which is a parameter of xref:System.Windows.Forms.PaintEventHandler.

See also

• How to: List Installed Encoders
• Types of Bitmaps
• Using Image Encoders and Decoders in Managed GDI+