/// <summary>
///
/// </summary>
/// <param name="im"></param>
/// <returns></returns>
private BitmapSource func_mi_回傳前壓縮圖片(ImageMagick.MagickImage im)
{
//2500
if (im.Width > M.b2.ActualWidth || im.Height > M.b2.ActualHeight) //縮小圖片後在載入
{
using (ImageMagick.IMagickImage ii = im.Clone()) {
//計算縮放比例
double d_縮放倍率 = 1;
var w03 = M.b2.ActualWidth;
var h03 = M.b2.ActualHeight;
if (ii.Width / w03 > ii.Height / h03)
{
d_縮放倍率 = M.b2.ActualWidth / ii.Width;
}
else
{
d_縮放倍率 = M.b2.ActualHeight / ii.Height;
}
//縮放
var mg = new ImageMagick.MagickGeometry();
mg.Height = (int)(ii.Height * d_縮放倍率);
mg.Width = (int)(ii.Width * d_縮放倍率);
ii.Resize(mg);
return(ii.ToBitmapSource());
}
}
else
{
return(im.ToBitmapSource());
}
}
public static double GetTransparencyRate(this ImageMagick.IMagickImage mi)
{
if (!mi.HasAlpha)
{
return(0d);
}
var bytes = mi.Separate(ImageMagick.Channels.Alpha).First().GetPixels().GetValues();
return((byte.MaxValue - bytes.Average(x => (double)x)) / byte.MaxValue);
}
