public void CreateThumbnail(Image img1, Photo photo, string targetDirectoryThumbs)
{
int newWidth = 700;
int newHeight = 700;
double ratio = 0;
if (img1.Width > img1.Height)
{
ratio = img1.Width / (double)img1.Height;
newHeight = (int)(newHeight / ratio);
}
else
{
ratio = img1.Height / (double)img1.Width;
newWidth = (int)(newWidth / ratio);
}
Image bmp1 = img1.GetThumbnailImage(newWidth, newHeight, null, IntPtr.Zero);
bmp1.Save(targetDirectoryThumbs + photo.PhotoID + ".jpg");
img1.Dispose();
bmp1.Dispose();
}
我已经把700px
以便您能够更好地洞察问题。
这是original图像和resized one.
有什么好的推荐吗?
Thanks,
Ile
你应该找到我的答案这个问题有帮助。它包括一个用 C# 进行高质量图像缩放的示例。
我的其他答案中的完整示例包括如何将图像保存为 jpeg。
这是相关的代码...
/// <summary>
/// Resize the image to the specified width and height.
/// </summary>
/// <param name="image">The image to resize.</param>
/// <param name="width">The width to resize to.</param>
/// <param name="height">The height to resize to.</param>
/// <returns>The resized image.</returns>
public static System.Drawing.Bitmap ResizeImage(System.Drawing.Image image, int width, int height)
{
//a holder for the result
Bitmap result = new Bitmap(width, height);
//use a graphics object to draw the resized image into the bitmap
using (Graphics graphics = Graphics.FromImage(result))
{
//set the resize quality modes to high quality
graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//draw the image into the target bitmap
graphics.DrawImage(image, 0, 0, result.Width, result.Height);
}
//return the resulting bitmap
return result;
}
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