How to Convert an Image to 16-bit Grayscale in C#?

Convert image to 16-bit grayscale in C#

Converting an image to 16-bit-per-pixel grayscale is different than simply setting the individual R, G, and B components to luminance values. Here's how you can achieve this in C#:

<code class="language-csharp">Bitmap grayScaleBP = new System.Drawing.Bitmap(2, 2, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale);</code>

Convert to grayscale

To convert an existing image to grayscale:

<code class="language-csharp">Bitmap c = new Bitmap("fromFile");
Bitmap d;
for (int x = 0; x < ...</code>

(Part of the code is omitted here because the original code is incomplete and has errors)

Faster options

For faster grayscale conversion, you can use ColorMatrix:

<code class="language-csharp">public static Bitmap MakeGrayscale3(Bitmap original)
{
    // 创建新的灰度图像
    Bitmap newBitmap = new Bitmap(original.Width, original.Height);

    // 从新图像获取图形上下文
    using (Graphics g = Graphics.FromImage(newBitmap))
    {
        // 定义灰度颜色矩阵
        ColorMatrix colorMatrix = new ColorMatrix(
            new float[][]
            {
                new float[] {.3f, .3f, .3f, 0, 0},
                new float[] {.59f, .59f, .59f, 0, 0},
                new float[] {.11f, .11f, .11f, 0, 0},
                new float[] {0, 0, 0, 1, 0},
                new float[] {0, 0, 0, 0, 1}
            });

        // 使用灰度颜色矩阵将原始图像绘制到新图像上
        using (ImageAttributes attributes = new ImageAttributes())
        {
            attributes.SetColorMatrix(colorMatrix);
            g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height),
                        0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);
        }
    }

    return newBitmap;
}</code>

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