vb net save bitmap to tiff CCITT4

Question

我已经使用了问题中的代码

What would be a good TRUE black and white colormatrix?

并且工作正常..但是当我尝试使用CCITT4压缩保存在TIFF中时，出现错误，参数值无效...如果我使用LZW压缩，它工作正常..我使用代码：

Dim myImageCodecInfo As ImageCodecInfo
myImageCodecInfo = GetEncoderInfo(ImageFormat.Tiff)

Dim myEncoderParameters As New EncoderParameters(1)
Dim myEncoderParameter As New EncoderParameter(System.Drawing.Imaging.Encoder.Compression, EncoderValue.CompressionCCITT4)
myEncoderParameters.Param(0) = myEncoderParameter

bmp.Save(path & "\test.tif", myImageCodecInfo, myEncoderParameters)

有人可以帮帮我吗？感谢..

Answer 1

项目解决了问题：

http://www.codeproject.com/Articles/15186/Bitonal-TIFF-Image-Converter-for-NET

bmp必须转换为双色调1bpp索引，否则CCITT4压缩格式的bmp.save函数会导致错误。