Question

有没有方便的方法用C＃调整图像大小？

Answer 1

以下链接可以帮助您：）

snippets.dzone.com/posts/show/4336

更新：如果您打算调整图像文件大小以节省空间，上面链接中的代码会实际调整大小并保存图像，否则如上所述，您只需手动设置图像控件上的高度/宽度。 / p>

Answer 2

如果您加载图像，则只需设置宽度/高度属性。

e.g。

Bitmap bmp = new Bitmap(@"c:\myfile.bmp");
bmp.Width = (int)(bmp.Width / 2);
bmp.Height = (int)(bmp.Height / 2);

Answer 3

将其加载到gdi +（system.drawing）并缩放？

Answer 4

检查一下

Simple Image Resizing Library

Answer 5

除了其他人所说的，对于小于300x300的图像，Image.GetThumbnailImage非常方便：

static void Main(string[] args)
{
    Bitmap b = new Bitmap(@"C:\Documents and Settings\juliet\My Documents\My Pictures\julietawesome.bmp");
    Image image = b.GetThumbnailImage(100, 100, null, IntPtr.Zero);
    image.Save(@"C:\Documents and Settings\juliet\My Documents\My Pictures\thumbnail.bmp", ImageFormat.Bmp);
}

Answer 6

由于没有其他人这样说过：尝试WPF。

Answer 7

Public Function ScaleByPercent(ByVal imgPhoto As Image, ByVal Percent As Integer) As Image

        Dim nPercent As Single = (CType(Percent, Single) / 100)
        Dim sourceWidth As Integer = imgPhoto.Width
        Dim sourceHeight As Integer = imgPhoto.Height
        Dim sourceX As Integer = 0
        Dim sourceY As Integer = 0

        Dim destX As Integer = 0
        Dim destY As Integer = 0
        Dim destWidth As Integer = CType((sourceWidth * nPercent), Integer)
        Dim destHeight As Integer = CType((sourceHeight * nPercent), Integer)

        Dim bmPhoto As New Bitmap(destWidth, destHeight, PixelFormat.Format24bppRgb)
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution)

        Dim grPhoto As Graphics = Graphics.FromImage(bmPhoto)
        grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic
        grPhoto.DrawImage(imgPhoto, New Rectangle(destX, destY, destWidth, destHeight), New Rectangle(sourceX, sourceY, sourceWidth, sourceHeight), GraphicsUnit.Pixel)
        grPhoto.Dispose()
        Return bmPhoto

    End Function

Answer 8

来自我的个人代码库。反正有点老了。

protected Image FixedSize(Image imgPhoto, int Width, int Height)
{
    int width = imgPhoto.Width;
    int height = imgPhoto.Height;
    int x = 0;
    int y = 0;
    int num5 = 0;
    int num6 = 0;
    float num7 = 0f;
    float num8 = 0f;
    float num9 = 0f;
    num8 = ((float) Width) / ((float) width);
    num9 = ((float) Height) / ((float) height);
    if (num9 < num8)
    {
        num7 = num9;
        num5 = Convert.ToInt16((float) ((Width - (width * num7)) / 2f));
    }
    else
    {
        num7 = num8;
        num6 = Convert.ToInt16((float) ((Height - (height * num7)) / 2f));
    }
    int num10 = (int) (width * num7);
    int num11 = (int) (height * num7);
    Bitmap image = new Bitmap(Width, Height, PixelFormat.Format24bppRgb);
    image.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
    Graphics graphics = Graphics.FromImage(image);
    graphics.Clear(ColorTranslator.FromHtml("#ffffff"));
    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
    graphics.DrawImage(imgPhoto, new Rectangle(num5, num6, num10, num11), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
    graphics.Dispose();
    return image;
}

调整图像大小

8 个答案: