只转换了一部分图像

Question

我们正在调整图片大小，我们正面临一个问题。图像的一部分正在调整大小，我们正在使用下面的代码。

public Bitmap ScaleImage(Bitmap image, int maxWidth, int maxHeight)
        {
            var ratioX = (double)maxWidth / image.Width;
            var ratioY = (double)maxHeight / image.Height;
            var ratio = 1.0;
            if (maxWidth == 0)
            {
                ratio = ratioY;
            }
            else if (maxHeight == 0)
            {
                ratio = ratioX;
            }
            else
            {
                ratio = Math.Min(ratioX, ratioY);
            }


            var newWidth = (int)(image.Width * ratio);
            var newHeight = (int)(image.Height * ratio);
            Graphics graphicsObj;
            var newImage = new Bitmap(newWidth, newHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            //var newImage = new Bitmap(newWidth, newHeight);
            graphicsObj = Graphics.FromImage(newImage);
            graphicsObj.Clear(Color.White);
            Graphics.FromImage(newImage).DrawImage(image, 0, 0, newWidth, newHeight);
            return newImage;
        }

请按照此link进行操作。