Bitmap Constructor (String, Boolean)
Initializes a new instance of the Bitmap class from the specified file.
Namespace: System.Drawing
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- filename
- Type: System.String
The name of the bitmap file.
- useIcm
- Type: System.Boolean
true to use color correction for this Bitmap; otherwise, false.
Use this constructor to open images with the following file formats: BMP, GIF, EXIF, JPG, PNG and TIFF. For more information about supported formats, see Types of Bitmaps. The file remains locked until the Bitmap is disposed.
The following code example demonstrates how to construct a new bitmap from a file. The example uses the GetPixel and SetPixel methods to recolor the image. It also uses the PixelFormat property.
This example is designed to be used with a Windows Form that contains a Label, PictureBox and Button named Label1, PictureBox1 and Button1, respectively. Paste the code into the form and associate the Button1_Click method with the button's Click event.
Dim image1 As Bitmap Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Try ' Retrieve the image. image1 = New Bitmap( _ "C:\Documents and Settings\All Users\Documents\My Music\music.bmp", _ True) Dim x, y As Integer ' Loop through the images pixels to reset color. For x = 0 To image1.Width - 1 For y = 0 To image1.Height - 1 Dim pixelColor As Color = image1.GetPixel(x, y) Dim newColor As Color = _ Color.FromArgb(pixelColor.R, 0, 0) image1.SetPixel(x, y, newColor) Next Next ' Set the PictureBox to display the image. PictureBox1.Image = image1 ' Display the pixel format in Label1. Label1.Text = "Pixel format: " + image1.PixelFormat.ToString() Catch ex As ArgumentException MessageBox.Show("There was an error." _ & "Check the path to the image file.") End Try End Sub
- SecurityPermission
for calling into unmanaged code. Related enumeration: UnmanagedCode
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.
