图像处理空间Aspose.Imaging v20.2全新功能上线！示例演示TIFF格式的不同栅格数据类型！

在Aspose.Imaging for .NET v20.2中，支持TIFF格式的不同栅格数据类型，优化Tiff和Gif格式的速度或内存，添加矢量和多页图像的新类，修复多项格式转换时发生的异常，接下来我们用示例演示新增的功能。

在Aspose.Imaging for .NET v20.2中，支持TIFF格式的不同栅格数据类型，优化Tiff和Gif格式的速度或内存，添加矢量和多页图像的新类，修复多项格式转换时发生的异常，接下来我们用示例演示新增的功能。

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新增与改善

key	概述	类别
IMAGINGNET-3624	支持TIFF格式的不同栅格数据类型	功能
IMAGINGNET-3588	将TIFF转换为PNG的异常	功能
IMAGINGNET-3409	允许针对Tiff格式的速度或内存优化策略	功能
IMAGINGNET-3408	允许针对Gif格式的速度或内存优化策略	功能
IMAGINGNET-3364	统一处理多页图像导出	功能
IMAGINGNET-2548	介绍矢量和多页图像的新类	功能
IMAGINGNET-3633	将Tiff图片转换为PNG的异常	增强功能
IMAGINGNET-3632	将jpeg转换为pdf的异常	增强功能
IMAGINGNET-3631	将JPG转换为PDF时的异常	增强功能
IMAGINGNET-3623	QA 19.11 .NET 3549不透明零件	增强功能

新功能用法示例

IMAGINGNET-3624支持TIFF格式的不同栅格数据类型

示例一：根据其自身的原始数据格式加载原始数据。

// Raw data after decoding is processed to eliminate format-specific effects (prediction and invert color component values).using (RasterImage image = (RasterImage)Image.Load("input.tif")){image.LoadRawData(image.Bounds, image.RawDataSettings, new CustomRawDataLoader());}

示例二：根据用户指定的原始数据格式加载原始数据。

// In this case, in addition, raw data is converted from its own format to the one specified by the user.// Note that so far not all raw data formats can be converted to other formats (since not all color converters are still implemented and registered at the ColorConverterFactory).using (RasterImage image = (RasterImage)Image.Load("input.tif")){   RawDataSettings rawDataSettings = new RawDataSettings()          {             PixelDataFormat = PixelDataFormat.Rgb24Bpp,             DitheringMethod = DitheringMethods.PaletteIgnore,          };   rawDataSettings.LineSize =       ((image.Width * rawDataSettings.PixelDataFormat.BitsPerPixel) + 7) / 8;image.LoadRawData(image.Bounds, image.RawDataSettings, new CustomRawDataLoader());}

示例三：加载未经处理的原始原始数据。

// Format-specific effects (prediction and invert color component values) may be present in this data, therefore this data cannot be used in color converters without pre-processing.using (RasterImage image = (RasterImage)Image.Load("input.tif")){image.LoadRawData(image.Bounds, null, new CustomRawDataLoader());}// Custom raw data loaderclass CustomRawDataLoader : IPartialRawDataLoader{   ////// Processes the loaded data.   //////The data rectangle.///The raw data.///The start data point. If not equal to (left,top) meaning that it is not full rectangle we have.///The end data point. If not equal to (right,bottom) meaning that it is not full rectangle we have.public void Process(Rectangle rectangle, byte[] data, Point start, Point end)    {       this.Process(rectangle, data, start, end, null);    }   ////// Processes the loaded data.   //////The data rectangle.///The raw data.///The start data point. If not equal to (left,top) meaning that it is not full rectangle we have.///The end data point. If not equal to (right,bottom) meaning that it is not full rectangle we have.///The load options.public void Process(Rectangle rectangle, byte[] data, Point start, Point end, LoadOptions loadOptions)    {       // custom raw data processing    }}

IMAGINGNET-3623 QA 19.11 .NET 3549不透明零件

using (Image image = Image.Load("sample_car.svg")){ image.Resize(image.Width * 2, image.Height * 2); image.Save("sample_car_resize_2_2.png", new PngOptions());}

IMAGINGNET-3409允许对Tiff格式进行速度或内存优化的策略

// Setting a memory limit of 10 megabytes for target loaded imageusing (Image image = Image.Load("Default.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("Default_export.tiff", new TiffOptions(TiffExpectedFormat.Default));}using (Image image = Image.Load("TiffCcitRle.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("TiffCcitRle_export.tiff", new TiffOptions(TiffExpectedFormat.TiffCcitRle));}using (Image image = Image.Load("TiffDeflateRgb.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("TiffDeflateRgb_export.tiff", new TiffOptions(TiffExpectedFormat.TiffDeflateRgb));}using (Image image = Image.Load("TiffJpegYCbCr.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("TiffJpegYCbCr_export.tiff", new TiffOptions(TiffExpectedFormat.TiffJpegYCbCr));}using (Image image = Image.Load("TiffLzwCmyk.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("TiffLzwCmyk_export.tiff", new TiffOptions(TiffExpectedFormat.TiffLzwCmyk));}using (Image image = Image.Load("TiffNoCompressionRgb.tiff", new LoadOptions { BufferSizeHint = 10 })){   image.Save("TiffNoCompressionRgb_export.tiff", new TiffOptions(TiffExpectedFormat.TiffNoCompressionRgb));}

IMAGINGNET-3408允许Gif格式的速度或内存优化策略

// Setting a memory limit of 10 megabytes for target loaded imageusing (Image image = Image.Load("flowers.gif", new LoadOptions { BufferSizeHint = 10 })){   image.Save("flowers_export.gif", new GifOptions());}

IMAGINGNET-3364统一处理多页图像输出

string baseFolder = "D:\images";string outputFolderName = Path.Combine(baseFolder, "out");string[] files = new[] { "MultiframePage1.dicom", "VariousObjectsMultiPage.odg" };foreach (string inputFileName in files) {   using (Image image = Image.Load(Path.Combine(baseFolder, inputFileName)))    {      PdfOptions imageOptions = new PdfOptions();      imageOptions.MultiPageOptions = new MultiPageOptions(new IntRange(1, 2));                  if (image is VectorImage)       {          imageOptions.VectorRasterizationOptions = (VectorRasterizationOptions)image.GetDefaultOptions(new object[] { Color.White, image.Width, image.Height });          imageOptions.VectorRasterizationOptions.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;          imageOptions.VectorRasterizationOptions.SmoothingMode = SmoothingMode.None;        }      string outFileName = Path.Combine(outputFolderName, inputFileName + ".pdf");      image.Save(outFileName, imageOptions);    } }

IMAGINGNET-2548引入矢量和多页图像的新类

1. 引入了抽象类VectorImage。并且库中的所有矢量图像都从此类继承。位图图像是从RasterImage继承的。这样就可以唯一地分离光栅图像和矢量图像。

   using (Image image = Image.Load(fileName)) {  if (image is VectorImage)  {  ...  } else {  ...  }}

2. 引入了IMultipageImage接口，借助它可以确定图像是否包含图层/页面/框架。所有多页图像（例如PSD，CDR，GIF等）都是该接口的后代。借助Pages属性，您可以访问库中任何多页图像的页面。

   using (Image image = Image.Load(fileName)) { if (image is IMultipageImage) {  var pages = ((IMultipageImage)image).Pages; } } 

3. 有了MultiPageOptions选项，导出多页图像变得更加容易。使用此选项，可以指定要导出为其他格式的页面。在导出为单页格式的情况下，将导出该范围的第一页；如果导出为多页面格式，则将导出该范围的所有页面。
   从多页格式导出到单页的示例：

   int startPage = 3;int countPage = 2;using (Image image = Image.Load(fileName)){ PngOptions pngOptions = new PngOptions(); pngOptions.MultiPageOptions = new MultiPageOptions(new IntRange(startPage, countPage));  image.Save(outFileName, pngOptions);} 

还想要更多吗可以点击阅读【2019 · Aspose最新资源整合】，查找需要的教程资源。如果您有任何疑问或需求，请随时联系客服，我们很高兴为您提供查询和咨询。
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