Resize

Resize(int, int)

调整图像大小。默认NearestNeighbourResample已使用。

public void Resize(int newWidth, int newHeight)

范围	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新高度。

例子

以下示例显示如何调整图元文件（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);
    }
}

以下示例显示如何调整 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());
        }
    }
}

也可以看看

• class Image
• 命名空间 Aspose.Imaging
• 部件 Aspose.Imaging

---

Resize(int, int, ResizeType)

调整图像大小。

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

范围	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新高度。
resizeType	ResizeType	调整大小类型。

例子

使用特定的调整大小类型调整图像大小。

[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");
}

此示例加载图像并使用各种调整大小的方法调整其大小。

[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"))
{
    // 使用双线性重采样缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, Aspose.Imaging.ResizeType.BilinearResample);
    image.Save(dir + "downsample.bilinear.gif");
}

使用分段掩码加快分段过程

[C#]

// 屏蔽导出选项
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();

// 背景颜色将是透明的。
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;

    // 减小图像大小以加快分割过程
    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);

    // 将源图像分成几个簇（段）。
    using (Aspose.Imaging.Masking.Result.MaskingResult maskingResult = masking.Decompose(maskingOptions))
    {
        // 获取前景蒙版
        using (Aspose.Imaging.RasterImage foregroundMask = maskingResult[1].GetMask()) 
        {
            // 将蒙版的大小增加到原始图像的大小
            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);
            }
        }
    }
}

也可以看看

• enum ResizeType
• class Image
• 命名空间 Aspose.Imaging
• 部件 Aspose.Imaging

---

Resize(int, int, ImageResizeSettings)

调整图像大小。

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

范围	类型	描述
newWidth	Int32	新的宽度。
newHeight	Int32	新高度。
settings	ImageResizeSettings	调整大小设置。

例子

使用特定的调整大小类型调整图像大小。

[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");
}

此示例加载图像并使用各种调整大小设置调整其大小。

[C#]

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

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

// 基于加权混合有理函数和 lanczos3 插值的自适应算法。
resizeSettings.Mode = Aspose.Imaging.ResizeType.AdaptiveResample;

// 小矩形过滤器
resizeSettings.FilterType = Aspose.Imaging.ImageFilterType.SmallRectangular;

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

// 不使用颜色量化
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"))
{
    // 使用自适应重采样缩小 2 倍。
    image.Resize(image.Width / 2, image.Height / 2, resizeSettings);
    image.Save(dir + "downsample.adaptive.gif");
}

也可以看看

• class ImageResizeSettings
• class Image
• 命名空间 Aspose.Imaging
• 部件 Aspose.Imaging