更新时间:2023-02-13 22:01:34
我有同样的问题而回,并处理了这种方式:
I had the same problem a while back and dealt with it this way:
private Image RezizeImage(Image img, int maxWidth, int maxHeight)
{
if(img.Height < maxHeight && img.Width < maxWidth) return img;
using (img)
{
Double xRatio = (double)img.Width / maxWidth;
Double yRatio = (double)img.Height / maxHeight;
Double ratio = Math.Max(xRatio, yRatio);
int nnx = (int)Math.Floor(img.Width / ratio);
int nny = (int)Math.Floor(img.Height / ratio);
Bitmap cpy = new Bitmap(nnx, nny, PixelFormat.Format32bppArgb);
using (Graphics gr = Graphics.FromImage(cpy))
{
gr.Clear(Color.Transparent);
// This is said to give best quality when resizing images
gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
gr.DrawImage(img,
new Rectangle(0, 0, nnx, nny),
new Rectangle(0, 0, img.Width, img.Height),
GraphicsUnit.Pixel);
}
return cpy;
}
}
private MemoryStream BytearrayToStream(byte[] arr)
{
return new MemoryStream(arr, 0, arr.Length);
}
private void HandleImageUpload(byte[] binaryImage)
{
Image img = RezizeImage(Image.FromStream(BytearrayToStream(binaryImage)), 103, 32);
img.Save("IMAGELOCATION.png", System.Drawing.Imaging.ImageFormat.Gif);
}
我刚刚看了说,这是获得最高质量的方式。
I just read that this was the the way to get highest quality.