WIA：保存文件时无压缩 [英] WIA: no compression when saving files

问题描述

我使用WIA扫描图像并注意到，图像没有有效地存储 SaveFile 显然没有使用压缩。

I'm using WIA for scanning images and noticed, that images aren't stored efficiently as SaveFile apparently doesn't make use of compression.

目前我正在使用此代码：

Currently I'm using this code:

WIA.ImageFile img = (WIA.ImageFile)item.Transfer(WIA.FormatID.wiaFormatPNG);
img.SaveFile(path); 

有没有办法使用WIA压缩，或者如何使用压缩保存图像？

Is there a way to use WIA for compression, or how else could I save the image using compression?

编辑：

使用以下代码我可以减小文件大小从25到10 MB。

Using the following code I was able to decrease file size from 25 to 10 MB.

WIA.ImageFile img = (WIA.ImageFile)item.Transfer(WIA.FormatID.wiaFormatPNG);
WIA.ImageProcess ImageProcess1 = new WIA.ImageProcessClass();
System.Object Object1 = null;
System.Object Object2 = null;
Object1 = (Object)"Convert";
ImageProcess1.Filters.Add(ImageProcess1.FilterInfos.get_Item(ref Object1).FilterID, 0);
Object1 = (Object)"FormatID";
Object2 = (Object)WIA.FormatID.wiaFormatPNG;
ImageProcess1.Filters[1].Properties.get_Item(ref Object1).set_Value(ref Object2);
img = ImageProcess1.Apply(img);
img.SaveFile(path); 

推荐答案

基本上你应该先添加一个压缩过滤器，图片，在此网址中，您可以找到tiff / jpg压缩的示例：

Basically you should add a compression filter before you save your image, in this url you can find a sample of tiff/jpg compression:

http://www.debugging.com/bug/18157

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