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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)

'Declaration
Public Shared ReadOnly ColorDepth As Encoder

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.

Imports System
Imports System.Drawing
Imports System.Drawing.Imaging
Imports Microsoft.VisualBasic


Class Example_SetColorDepth

    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("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, CType(24L, Int32))
        myEncoderParameters.Param(0) = myEncoderParameter
        myBitmap.Save("Shapes24bpp.tiff", 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 
End Class

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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