参数无效时节省TIFF流 [英] Parameter is not valid when saving TIFF to stream

问题描述

我有一个多页TIFF说我分手了逐页使用LEADTOOLS，并改变对他们的COM pression是与第三方兼容。当我尝试将图像保存到一个MemoryStream，我得到一个参数无效例外。然而，这种的只有的情况发生在其计算机上，或我的测试机运行Server 2008。我不能在我的开发机器上重现此（使用VS2008的Win 7）。这里是code：

I have a multi-page TIFF that I'm splitting up page by page using Leadtools, and changing the compression on them to be compatible with a third party. When I try to save the image to a memoryStream, I get a Parameter is not valid exception. However, this only happens on their machine, or my test machine running Server 2008. I cannot reproduce this on my development machine (Win 7 using VS2008). Here is the code:

              RasterImage image = codecs.Load( file, 0, CodecsLoadByteOrder.RgbOrGray, currentPage, currentPage + (detail.Pages - 1) );
              Image newImage = RasterImageConverter.ConvertToImage( image, ConvertToImageOptions.None );
              MemoryStream memStream = new MemoryStream();

              ImageCodecInfo encoderInfo = GetEncoderInfo(  );

              EncoderParameters encoderParams = new EncoderParameters( 1 );
              EncoderParameter parameter = new EncoderParameter( System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionCCITT4 );
              encoderParams.Param[0] = parameter;
              newImage.Save(memStream, encoderInfo , encoderParams);

在这个有什么想法？感谢您的帮助！

Any thoughts on this? Thanks for the help!

推荐答案

检查图像的像素格式。如果什么事比1位等，这将失败 - 你不能对任何事情比1位其他使用CCITT。它也可能是因为特定的OS不具有CCITT4子codec且可能仅具有一个CCITT3（虽然这是非常不可能的）。

Check the pixel format of the image. If it's anything other than 1 bit, this will fail - you can't use CCITT on anything other than 1 bit. It could also be that the particular OS doesn't have a CCITT4 subcodec and might only have a CCITT3 (although this is highly unlikely).

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