WPF 修改图片分辨率简单方法
先把ImagSource转成BitMap 再转换分辨率后保存到本地
///
/// 转换1
///
///
///
public static System.Drawing.Bitmap ImageSourceToBitmap(ImageSource imageSource)
{
BitmapSource m = (BitmapSource)imageSource;
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(m.PixelWidth, m.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb); // 坑点：选Format32bppRgb将不带透明度
System.Drawing.Imaging.BitmapData data = bmp.LockBits(
new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
m.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);
bmp.UnlockBits(data);
return bmp;
}
///
/// 转换2
///
///
///
public static Bitmap KiResizeImage(Bitmap bmp, int newW, int newH)
{
try
{
Bitmap b = new Bitmap(newW, newH);
Graphics g = Graphics.FromImage(b);
// 插值算法的质量
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(bmp, new System.Drawing.Rectangle(0, 0, newW, newH), new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
g.Dispose();
return b;
}
catch
{
return null;
}
}
///
/// 调用
///
///
///
Bitmap bp=KiResizeImage(ImageSourceToBitmap(ysw.Source), 1920, 1080);
bp.Save(@"C:\Users\Administrator\Desktop\666.png", System.Drawing.Imaging.ImageFormat.Png);
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