索引图像的图形 [英] Graphics on indexed image

问题描述

我收到错误：

图形对象不能从具有索引
像素格式的图像创建。

"A Graphics object cannot be created from an image that has an indexed pixel format."

在功能：

public static void AdjustImage(ImageAttributes imageAttributes, Image image)
{
        Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);

        Graphics g = Graphics.FromImage(image);       
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.DrawImage(image, rect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, imageAttributes);
        g.Dispose();
}

我想问问你，我该怎么解决这个问题？

I would like to ask you, how can I fix it?

推荐答案

指的的此时，它可以通过创建与具有相同尺寸的空白位图和正确的PixelFormat并在该位图绘制解决。

Refering to this, it can be solved by creating a blank bitmap with the same dimensions and the correct PixelFormat and the draw on that bitmap.

// The original bitmap with the wrong pixel format. 
// You can check the pixel format with originalBmp.PixelFormat
Bitmap originalBmp = new (Bitmap)Image.FromFile("YourFileName.gif");

// Create a blank bitmap with the same dimensions
Bitmap tempBitmap = new Bitmap(originalBmp.Width, originalBmp.Height);

// From this bitmap, the graphics can be obtained, because it has the right PixelFormat
using(Graphics g = Graphics.FromImage(tempBitmap))
{
    // Draw the original bitmap onto the graphics of the new bitmap
    g.DrawImage(originalBmp, 0, 0);
    // Use g to do whatever you like
    g.DrawLine(...);
}

// Use tempBitmap as you would have used originalBmp
return tempBitmap;

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