Image.Resize

Resize(int, int, ResizeType)

调整图像大小。

public virtual void Resize(int newWidth, int newHeight, ResizeType resizeType)

参数	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新的高度。
resizeType	ResizeType	缩放类型。

示例

调整 EPS 图像大小并导出为 PNG 格式。

[C#]

// 加载 EPS 图像
using (var image = Image.Load("AstrixObelix.eps"))
{
    // 使用 Mitchell 三次插值方法调整图像大小
    image.Resize(400, 400, ResizeType.Mitchell);

    // 将图像导出为 PNG 格式
    image.Save("ExportResult.png", new PngOptions());
}

使用特定的缩放类型调整图像大小。

[C#]

using (var image = Image.Load("Photo.jpg"))
{
    image.Resize(640, 480, ResizeType.CatmullRom);
    image.Save("ResizedPhoto.jpg");

    image.Resize(1024, 768, ResizeType.CubicConvolution);
    image.Save("ResizedPhoto2.jpg");

    var resizeSettings = new ImageResizeSettings
    {
        Mode = ResizeType.CubicBSpline,
        FilterType = ImageFilterType.SmallRectangular
    };

    image.Resize(800, 800, resizeSettings);
    image.Save("ResizedPhoto3.jpg");
}

此示例加载 WMF 图像并使用各种缩放方法调整大小。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.wmf"))
{
    // 使用最近邻重采样将尺寸放大 2 倍。
    image.Resize(image.Width * 2, image.Height * 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.wmf"))
{
    // 使用最近邻重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.wmf"))
{
    // 使用双线性重采样将尺寸放大 2 倍。
    image.Resize(image.Width * 2, image.Height * 2, Aspose.Imaging.ResizeType.BilinearResample);
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.wmf"))
{
    // 使用双线性重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.BilinearResample);
}

此示例加载图像并使用多种调整大小方法对其进行缩放。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用最近邻重采样将尺寸放大 2 倍。
    image.Resize(image.Width* 2, image.Height* 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
    image.Save(dir + "upsample.nearestneighbour.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用最近邻重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
    image.Save(dir + "downsample.nearestneighbour.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用双线性重采样将尺寸放大 2 倍。
    image.Resize(image.Width* 2, image.Height* 2, Aspose.Imaging.ResizeType.BilinearResample);
    image.Save(dir + "upsample.bilinear.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用双线性重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.BilinearResample);
    image.Save(dir + "downsample.bilinear.gif");
}

此示例加载栅格图像并使用各种缩放方法调整大小。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用最近邻重采样将尺寸放大 2 倍。
    image.Resize(image.Width * 2, image.Height * 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
    image.Save(dir + "upsample.nearestneighbour.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用最近邻重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);
    image.Save(dir + "downsample.nearestneighbour.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用双线性重采样将尺寸放大 2 倍。
    image.Resize(image.Width * 2, image.Height * 2, Aspose.Imaging.ResizeType.BilinearResample);
    image.Save(dir + "upsample.bilinear.gif");
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用双线性重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.BilinearResample);
    image.Save(dir + "downsample.bilinear.gif");
}

此示例加载多页 ODG 图像并使用各种缩放方法调整大小。

[C#]

string dir = "c:\\temp\\";

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.odg"))
{
    // 使用最近邻重采样将尺寸放大 2 倍。
    image.Resize(image.Width* 2, image.Height* 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);

    // 使用默认选项保存为 PNG。
    image.Save(dir + "upsample.nearestneighbour.png", new Aspose.Imaging.ImageOptions.PngOptions());
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.odg"))
{
    // 使用最近邻重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.NearestNeighbourResample);

    // 使用默认选项保存为 PNG。
    image.Save(dir + "downsample.nearestneighbour.png", new Aspose.Imaging.ImageOptions.PngOptions());
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.odg"))
{
    // 使用双线性重采样将尺寸放大 2 倍。
    image.Resize(image.Width* 2, image.Height* 2, Aspose.Imaging.ResizeType.BilinearResample);

    // 使用默认选项保存为 PNG。
    image.Save(dir + "upsample.bilinear.png", new Aspose.Imaging.ImageOptions.PngOptions());
}

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.odg"))
{
    // 使用双线性重采样将尺寸缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.BilinearResample);

    // 使用默认选项保存为 PNG。
    image.Save(dir + "downsample.bilinear.png", new Aspose.Imaging.ImageOptions.PngOptions());
}

使用分段掩码加速分割过程

[C#]

// 掩码导出选项
Aspose.Imaging.ImageOptions.PngOptions exportOptions = new Aspose.Imaging.ImageOptions.PngOptions();
exportOptions.ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.TruecolorWithAlpha;
exportOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream());

Aspose.Imaging.Masking.Options.MaskingOptions maskingOptions = new Aspose.Imaging.Masking.Options.MaskingOptions();
    
// 使用 GraphCut 聚类。
maskingOptions.Method = Masking.Options.SegmentationMethod.GraphCut;
maskingOptions.Decompose = false;
maskingOptions.Args = new Aspose.Imaging.Masking.Options.AutoMaskingArgs();

// 背景颜色将变为透明。
maskingOptions.BackgroundReplacementColor = Aspose.Imaging.Color.Transparent;
maskingOptions.ExportOptions = exportOptions;

string dir = "c:\\temp\\";
using (Aspose.Imaging.RasterImage image = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "BigImage.jpg"))
{
    Aspose.Imaging.Size imageSize = image.Size;

    // 减小图像尺寸以加速分割过程
    image.ResizeHeightProportionally(600, Aspose.Imaging.ResizeType.HighQualityResample);

    // 创建 ImageMasking 类的实例。
    Aspose.Imaging.Masking.ImageMasking masking = new Aspose.Imaging.Masking.ImageMasking(image);

    // 将源图像划分为多个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 获取前景掩码
        using (Aspose.Imaging.RasterImage foregroundMask = maskingResult[1].GetMask()) 
        {
            // 将掩码大小增至原始图像的尺寸
            foregroundMask.Resize(imageSize.Width, imageSize.Height, Aspose.Imaging.ResizeType.NearestNeighbourResample);

            // 将掩码应用于原始图像以获得前景段
            using (Aspose.Imaging.RasterImage originImage = (Aspose.Imaging.RasterImage)Aspose.Imaging.Image.Load(dir + "BigImage.jpg"))
            {
                Aspose.Imaging.Masking.ImageMasking.ApplyMask(originImage, foregroundMask, maskingOptions);
                originImage.Save(dir + "BigImage_foreground.png", exportOptions);
            }
        }
    }
}

另请参见

• enum ResizeType
• class Image
• namespace Aspose.Imaging
• assembly Aspose.Imaging

---

Resize(int, int, ImageResizeSettings)

调整图像大小。

public abstract void Resize(int newWidth, int newHeight, ImageResizeSettings settings)

参数	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新的高度。
设置	ImageResizeSettings	缩放设置。

示例

使用特定的缩放类型调整图像大小。

[C#]

using (var image = Image.Load("Photo.jpg"))
{
    image.Resize(640, 480, ResizeType.CatmullRom);
    image.Save("ResizedPhoto.jpg");

    image.Resize(1024, 768, ResizeType.CubicConvolution);
    image.Save("ResizedPhoto2.jpg");

    var resizeSettings = new ImageResizeSettings
    {
        Mode = ResizeType.CubicBSpline,
        FilterType = ImageFilterType.SmallRectangular
    };

    image.Resize(800, 800, resizeSettings);
    image.Save("ResizedPhoto3.jpg");
}

使用高级设置调整 EPS 图像大小。

[C#]

// 加载 EPS 图像
using (var image = Image.Load("AstrixObelix.eps"))
{
    // 使用高级缩放设置调整图像大小
    image.Resize(400, 400, new ImageResizeSettings
    {
        // 设置插值模式
        Mode = ResizeType.LanczosResample,

        // 设置过滤器类型
        FilterType = ImageFilterType.SmallRectangular,

        // 设置颜色比较方法
        ColorCompareMethod = ColorCompareMethod.Euclidian,

        // 设置颜色量化方法
        ColorQuantizationMethod = ColorQuantizationMethod.Popularity
    });

    // 将图像导出为 PNG 格式
    image.Save("ExportResult.png", new PngOptions());
}

此示例加载图像并使用各种调整大小设置对其进行缩放。

[C#]

string dir = "c:\\temp\\";

Aspose.Imaging.ImageResizeSettings resizeSettings = new Aspose.Imaging.ImageResizeSettings();

// 基于加权和混合有理函数以及 Lanczos3 插值的自适应算法。
resizeSettings.Mode = Aspose.Imaging.ResizeType.AdaptiveResample;

// 小矩形滤波器
resizeSettings.FilterType = Aspose.Imaging.ImageFilterType.SmallRectangular;

// 调色板中的颜色数量。
resizeSettings.EntriesCount = 256;

// 未使用颜色量化
resizeSettings.ColorQuantizationMethod = ColorQuantizationMethod.None;

// 欧几里得方法
resizeSettings.ColorCompareMethod = ColorCompareMethod.Euclidian;

using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(dir + "sample.gif"))
{
    // 使用自适应重采样将尺寸缩小两倍。
    image.Resize(image.Width / 2, image.Height / 2, resizeSettings);
    image.Save(dir + "downsample.adaptive.gif");
}

另请参见

• class ImageResizeSettings
• class Image
• namespace Aspose.Imaging
• assembly Aspose.Imaging

---

Resize(int, int)

调整图像大小。默认使用 NearestNeighbourResample。

public void Resize(int newWidth, int newHeight)

参数	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新的高度。

示例

以下示例展示了如何调整元文件（WMF 和 EMF）的大小。

[C#]

string dir = "c:\\aspose.imaging\\issues\\net\\3280\\";
string[] fileNames = new[] { "image3.emf", "image4.wmf" };
foreach (string fileName in fileNames)
{
    string inputFilePath = dir + fileName;
    string outputFilePath = dir + "Downscale_" + fileName;

    using (Aspose.Imaging.FileFormats.Emf.MetaImage image = (Aspose.Imaging.FileFormats.Emf.MetaImage)Aspose.Imaging.Image.Load(inputFilePath))
    {
        image.Resize(image.Width / 4, image.Height / 4);
        image.Save(outputFilePath);
    }
}

以下示例展示了如何调整 SVG 图像的大小并将其保存为 PNG。

[C#]

string dir = "c:\\aspose.imaging\\net\\issues\\3549";
string[] fileNames = new string[]
{
    "Logotype.svg",
    "sample_car.svg",
    "rg1024_green_grapes.svg",
    "MidMarkerFigure.svg",
    "embeddedFonts.svg"
};

Aspose.Imaging.PointF[] scales = new Aspose.Imaging.PointF[]
{
    new Aspose.Imaging.PointF(0.5f, 0.5f),
    new Aspose.Imaging.PointF(1f, 1f),
    new Aspose.Imaging.PointF(2f, 2f),
    new Aspose.Imaging.PointF(3.5f, 9.2f),
};

foreach (string inputFile in fileNames)
{
    foreach (Aspose.Imaging.PointF scale in scales)
    {
        string outputFile = string.Format("{0}_{1}_{2}.png", inputFile, scale.X.ToString(System.Globalization.CultureInfo.InvariantCulture), scale.Y.ToString(System.Globalization.CultureInfo.InvariantCulture));
        using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(System.IO.Path.Combine(dir, inputFile)))
        {
            image.Resize((int)(image.Width * scale.X), (int)(image.Height * scale.Y));
            image.Save(System.IO.Path.Combine(dir, outputFile), new Aspose.Imaging.ImageOptions.PngOptions());
        }
    }
}

另请参见

• class Image
• namespace Aspose.Imaging
• assembly Aspose.Imaging