【转】图片分辨率无损转换

转自：http://zhidao.baidu.com/link?url=Rc1S974ka35Sgc9aeEhbNlUP7BqWkqqhfSAizBk64J8bmgyYvmIkRQE8eMjz-5i61lasNPOA3YbL4J5_hd2Vc_

C# 72dpi的图片怎么转换为300dpi

2010-08-30 11:08匿名 | 分类：C#/.NET | 浏览2500次

C# 72dpi的图片怎么转换为300dpi，要求图片无损，不仅仅是修改下图片的dpi参数就好了。修改后的图片大小应该和原图片大小一样，但是尺寸会变小。类似于在ps中图像大小更改里的取消重定图像像素，更改dpi的方法

分享到： 2010-08-30 13:47知识大富翁，挑战答题赢iPhone！提问者采纳

if (this.pbMain.Image.VerticalResolution <200||this.pbMain.Image.HorizontalResolution < 200)
                    {
                        //System.Drawing.Image img = System.Drawing.Image.FromHbitmap(((Bitmap)this.images[0]).GetHbitmap());
                        //float x = img.VerticalResolution;
                        //float y = img.HorizontalResolution;
                        int width = ((Bitmap)this.images[0]).Width;
                        int height = ((Bitmap)this.images[0]).Height;
                        if (height > width)
                        {
                            height = 2338;
                            width = 1653;

                        }
                        else if (width > height)
                        {
                            height = 1653;
                            width = 2338;
                        }
                        Bitmap bmpSource = new Bitmap(((Bitmap)this.images[0]), width, height);
                        //Bitmap bmpSource = new Bitmap(((Bitmap)this.images[0]));
                        int iSourceWidth = bmpSource.Width;
                        int iSourceHeight = bmpSource.Height;
                        float fSourceHorResolution = bmpSource.HorizontalResolution;
                        float fSourceVerResolution = bmpSource.VerticalResolution;
                        //图象dpi
                        float fTargetHorResolution = 200;
                        float fTargetVerResolution = 200;
                        Bitmap bmpTarget = new Bitmap(width, height);
                        Graphics g = Graphics.FromImage(bmpTarget);
                        g.DrawImage(bmpSource, 0, 0, iSourceWidth, iSourceHeight);
                        bmpTarget.SetResolution(fTargetHorResolution, fTargetVerResolution);
                        bmpTarget = TiffManager.KiSharpen(bmpTarget, (float)0.7);
                        bmpTarget = TiffManager.ConvertTo1bbpIndexed(bmpTarget, (float)0.8);
                        bmpTarget.Save(filename, info, ep);
                    }

这个是网上看到的一些代码，希望对你有用。。。参考看看