在C＃转换位图的PixelFormats [英] Converting Bitmap PixelFormats in C#

问题描述

我需要一个位图转换 PixelFormat.Format32bppRgb 到 PixelFormat.Format32bppArgb 。

I need to convert a Bitmap from PixelFormat.Format32bppRgb to PixelFormat.Format32bppArgb.

我希望利用Bitmap.Clone，但它似乎并不奏效。

I was hoping to use Bitmap.Clone, but it does not seem to be working.

Bitmap orig = new Bitmap("orig.bmp");
Bitmap clone = orig.Clone(new Rectangle(0,0,orig.Width,orig.Height), PixelFormat.Format24bppArgb);

如果我运行上面的code，然后检查clone.PixelFormat它设置为 PixelFormat.Format32bppRgb 。这是怎么回事/我怎么转换格式？

If I run the above code and then check clone.PixelFormat it is set to PixelFormat.Format32bppRgb. What is going on/how do I convert the format?

推荐答案

马虎，不寻常的GDI +。这种修复它：

Sloppy, not uncommon for GDI+. This fixes it:

        Bitmap orig = new Bitmap(@"c:\temp\24bpp.bmp");
        Bitmap clone = new Bitmap(orig.Width, orig.Height, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
        using (Graphics gr = Graphics.FromImage(clone)) {
            gr.DrawImage(orig, new Rectangle(0, 0, clone.Width, clone.Height));
        }
        // Dispose orig as necessary..

这篇关于在C＃转换位图的PixelFormats的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！