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Encoder.ColorDepth Field

An Encoder object that is initialized with the globally unique identifier for the color depth parameter category.

Namespace:  System.Drawing.Imaging
Assembly:  System.Drawing (in System.Drawing.dll)
public static readonly Encoder ColorDepth

When you pass a parameter to an image encoder, the parameter is encapsulated in an EncoderParameter object. One of the fields of the EncoderParameter object is a GUID that specifies the category of the parameter. Use the static fields of the Encoder class to retrieve an Encoder that contains parameters of the desired category.

The image encoders that are built into GDI+ receive parameters that belong to several categories. The following table lists all the categories and the GUID associated with each category.

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

The following example creates a Bitmap object from a BMP file. The code saves the image as a TIFF file that has a color depth of 24 bits per pixel.

using System;
using System.Drawing;
using System.Drawing.Imaging;
class Example_SetColorDepth
{
    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(@"C:\Documents and Settings\All Users\Documents\My Music\music.bmp");

        // Get an ImageCodecInfo object that represents the TIFF codec.
        myImageCodecInfo = GetEncoderInfo("image/tiff");

        // Create an Encoder object based on the GUID 
        // for the ColorDepth parameter category.
        myEncoder = Encoder.ColorDepth;

        // 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 image with a color depth of 24 bits per pixel.
        myEncoderParameter =
            new EncoderParameter(myEncoder, 24L);
        myEncoderParameters.Param[0] = myEncoderParameter;
        myBitmap.Save("Shapes24bpp.tiff", 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;
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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