彩票走势图

Aspose.Imaging for .NET是一种高级图像处理控件，允许开发人员创建，编辑，绘制或转换图像。图像导出和转换是API核心功能之一，它允许在不安装Photoshop应用程序或任何其他图像编辑器的情况下保存为AdobePhotoshop®本机格式。

事实证明，Aspose.Imaging是处理各种图像格式的强大API。除单页图像外，Aspose.Imaging还支持处理多页图像，包括GIF，TIFF，PSD，DICOM，CDR和WebP。

近期发布了Aspose.Imaging for .NET v20.9，在Dicom导出器中支持Jpeg，Jpeg2000和RLE压缩方法，支持将PNG转换为TGA格式，以WebP格式实现对Exif块的支持，修复保存SVG和TIFF时图像保存失败异常，还没使用过的朋友可以点击下载最新版Aspose.Imaging（安装包仅提供部分功能，并设置限制，如需试用完整功能请）。

新增与改善

用法示例

IMAGINGNET-4045 PSD导出器不支持压缩方法

// When exporting to PSD, options for compression, color type and bitness are available:

using (Image image = Image.Load(SRC)) 
{
 // Export to PSD with RLE compression
 image.Save(DEST1, new PsdOptions() { 
  CompressionMethod = CompressionMethod.RLE 
 });

 // Export to PSD with RGB color type
 image.Save(DEST2, new PsdOptions() { 
  ColorMode = ColorModes.Rgb, 
  ChannelsCount = 3, 
  ChannelBitsCount = 8 
 });

IMAGINGNET-4067 导出PSD图像时不考虑Alpha通道

using (Image image = Image.Load("Progressive.png"))
{
    image.Save("Progressive.png.psd", new PsdOptions()
                                   {
                                       CompressionMethod = CompressionMethod.RLE,
                                       ColorMode = ColorModes.Rgb,
                                       ChannelBitsCount = 8,
                                       ChannelsCount = 4
                                   });
}

IMAGINGNET-4018 在Dicom导出器中支持Jpeg，Jpeg2000和RLE压缩方法

### What is a DICOM Image File?
The DICOM standard is useful for integrating all modern imaging equipments, accessories, networking servers, workstations and printers. Because of its ease of integration and continuous evolution this communication standard has over the years achieved a nearly universal level of acceptance among vendors of radiological equipment.

A DICOM image file is an outcome of the Digital Imaging and Communications in Medicine standard. Specifically, image files that are compliant with part 10 of the DICOM standard are generally referred to as “DICOM format files” or simply “DICOM files” and are represented as “.dcm”.

### DICOM compression settings
The property ***DicomOptions.Compression*** allows you to specify compression settings. For instance, ***CompressionType*** enumeration allows you to select compression algorithm: *None*, *Jpeg*, *Jpeg2000* or *Rle*. The *None* option corresponds to uncompressed DICOM image. The following code shows how to use DICOM compression settings:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions
    {
        ColorType = ColorType.Rgb24Bit,
        Compression = new Compression { Type = CompressionType.None }
    };

    inputImage.Save("original_Uncompressed.dcm", options);
}

### Using JPEG compression in DICOM image
To use JPEG compression algorithm you should specify *CompressionType.Jpeg* enumeration value in ***Compression.Type*** property:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions
    {
        ColorType = ColorType.Rgb24Bit,
        Compression = new Compression { Type = CompressionType.Jpeg }
    };

    inputImage.Save("original_JPEG.dcm", options);
}

You can tune JPEG compression algorithm using ***Compression.Jpeg*** property. For instance, you can specify the *CompressionType*, *SampleRoundingMode* and *Quality*:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions
    {
        ColorType = ColorType.Rgb24Bit,
        Compression = new Compression
        {
            Type = CompressionType.Jpeg,
            Jpeg = new JpegOptions
            {
                CompressionType = JpegCompressionMode.Baseline,
                SampleRoundingMode = SampleRoundingMode.Truncate,
                Quality = 50
            }
        }
    };

    inputImage.Save("original_JPEG_2.dcm", options);
}

### Using JPEG 2000 compression in DICOM image
To use JPEG 2000 compression you need to use *CompressionType.Jpeg2000* enumeration value and ***Jpeg2000Options*** class for algorithm settings. The following code demonstrates how to specify JPEG 2000 *Codec* and *Irreversible* properties:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions
    {
        ColorType = ColorType.Rgb24Bit,
        Compression = new Compression
        {
            Type = CompressionType.Jpeg2000,
            Jpeg2000 = new Jpeg2000Options
            {
                Codec = Jpeg2000Codec.Jp2,
                Irreversible = false
            }
        }
    };

    inputImage.Save("original_JPEG2000.dcm", options);
}

### Using RLE compression in DICOM image
For this compression type you need to use *CompressionType.Rle* enumeration value. The RLE compression algorithm doesn't have additional settings. The following code shows how you can use RLE compression algorithm in DICOM image:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions
    {
        ColorType = ColorType.Rgb24Bit,
        Compression = new Compression { Type = CompressionType.Rle }
    };

    inputImage.Save("original_RLE.dcm", options);
}

### How to change Color Type in DICOM compression
The property ***DicomOptions.ColorType*** allows you to change color type in DICOM compression. There are several supported color types: *Grayscale8Bit*, *Grayscale16Bit* and *Rgb24Bit*. Use the following code in order to change the color type:

using (var inputImage = Image.Load("original.jpg"))
{
    var options = new DicomOptions { ColorType = ColorType.Grayscale8Bit };

    inputImage.Save("original_8Bit.dcm", options);
}