将8位彩色bmp图像转换为8位灰度bmp

问题描述

这是我的位图对象

Bitmap b = new Bitmap(columns, rows, PixelFormat.Format8bppIndexed);
BitmapData bmd = b.LockBits(new Rectangle(0, 0, columns, rows), ImageLockMode.ReadWrite, b.PixelFormat);

如何将其转换为8位灰度位图?

How do i convert this into a 8 bit grayscale bitmap ?

推荐答案

您可以将调色板更改为灰度调色板

hi you could change the color palette to a grayscale one

尽管下面的代码在Vb.net中.您可以轻松地将其转换为C#

although the following code is in Vb.net. You could easily convert it to C#

Private Function GetGrayScalePalette() As ColorPalette
    Dim bmp As Bitmap = New Bitmap(1, 1, Imaging.PixelFormat.Format8bppIndexed)

    Dim monoPalette As ColorPalette = bmp.Palette

    Dim entries() As Color = monoPalette.Entries

    Dim i As Integer
    For i = 0 To 256 - 1 Step i + 1
        entries(i) = Color.FromArgb(i, i, i)
    Next

    Return monoPalette
End Function

原始来源-> http://social.msdn.microsoft.com/Forums/en-us/vblanguage/thread/500f7827-06cf-4646-a4a1-e075c16bbb38

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